€•Œsphinx.addnodes”Œdocument”“”)”}”(Œ rawsource”Œ”Œchildren”]”(Œtranslations”Œ LanguagesNode”“”)”}”(hhh]”(hŒpending_xref”“”)”}”(hhh]”Œdocutils.nodes”ŒText”“”ŒChinese (Simplified)”…””}”(hhŒparent”hubaŒ attributes”}”(Œids”]”Œclasses”]”Œnames”]”Œdupnames”]”Œbackrefs”]”Œ refdomain”Œstd”Œreftype”Œdoc”Œ reftarget”Œ"/translations/zh_CN/admin-guide/md”Œmodname”NŒ classname”NŒrefexplicit”ˆuŒtagname”hhhubh)”}”(hhh]”hŒChinese (Traditional)”…””}”(hhhh2ubah}”(h]”h ]”h"]”h$]”h&]”Œ refdomain”h)Œreftype”h+Œ reftarget”Œ"/translations/zh_TW/admin-guide/md”Œmodname”NŒ classname”NŒrefexplicit”ˆuh1hhhubh)”}”(hhh]”hŒItalian”…””}”(hhhhFubah}”(h]”h ]”h"]”h$]”h&]”Œ refdomain”h)Œreftype”h+Œ reftarget”Œ"/translations/it_IT/admin-guide/md”Œmodname”NŒ classname”NŒrefexplicit”ˆuh1hhhubh)”}”(hhh]”hŒJapanese”…””}”(hhhhZubah}”(h]”h ]”h"]”h$]”h&]”Œ refdomain”h)Œreftype”h+Œ reftarget”Œ"/translations/ja_JP/admin-guide/md”Œmodname”NŒ classname”NŒrefexplicit”ˆuh1hhhubh)”}”(hhh]”hŒKorean”…””}”(hhhhnubah}”(h]”h ]”h"]”h$]”h&]”Œ refdomain”h)Œreftype”h+Œ reftarget”Œ"/translations/ko_KR/admin-guide/md”Œmodname”NŒ classname”NŒrefexplicit”ˆuh1hhhubh)”}”(hhh]”hŒSpanish”…””}”(hhhh‚ubah}”(h]”h ]”h"]”h$]”h&]”Œ refdomain”h)Œreftype”h+Œ reftarget”Œ"/translations/sp_SP/admin-guide/md”Œmodname”NŒ classname”NŒrefexplicit”ˆuh1hhhubeh}”(h]”h ]”h"]”h$]”h&]”Œcurrent_language”ŒEnglish”uh1h hhŒ _document”hŒsource”NŒline”NubhŒsection”“”)”}”(hhh]”(hŒtitle”“”)”}”(hŒRAID arrays”h]”hŒRAID arrays”…””}”(hhªhh¨hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h¦hh£hžhhŸŒ,,,,dev0,dev1,...,devn”h]”hŒTmd=,,,,dev0,dev1,...,devn”…””}”(hhhj5ubah}”(h]”h ]”h"]”h$]”h&]”Œ xml:space”Œpreserve”uh1j3hŸh¶h Khh·hžhubhé)”}”(hŒ-for raid arrays with persistent superblocks::”h]”hŒ,for raid arrays with persistent superblocks:”…””}”(hŒ,for raid arrays with persistent superblocks:”hjEhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h Khh·hžhubj4)”}”(hŒ%md=,dev0,dev1,...,devn”h]”hŒ%md=,dev0,dev1,...,devn”…””}”(hhhjTubah}”(h]”h ]”h"]”h$]”h&]”jCjDuh1j3hŸh¶h Khh·hžhubhé)”}”(hŒ'or, to assemble a partitionable array::”h]”hŒ&or, to assemble a partitionable array:”…””}”(hŒ&or, to assemble a partitionable array:”hjbhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h Khh·hžhubj4)”}”(hŒ&md=d,dev0,dev1,...,devn”h]”hŒ&md=d,dev0,dev1,...,devn”…””}”(hhhjqubah}”(h]”h ]”h"]”h$]”h&]”jCjDuh1j3hŸh¶h Khh·hžhubh¢)”}”(hhh]”(h§)”}”(hŒ``md device no.``”h]”hŒliteral”“”)”}”(hj„h]”hŒ md device no.”…””}”(hhhjˆhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j†hj‚ubah}”(h]”h ]”h"]”h$]”h&]”uh1h¦hjhžhhŸh¶h Kubhé)”}”(hŒThe number of the md device”h]”hŒThe number of the md device”…””}”(hjhj›hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h KhjhžhubhŒtable”“”)”}”(hhh]”hŒtgroup”“”)”}”(hhh]”(hŒcolspec”“”)”}”(hhh]”h}”(h]”h ]”h"]”h$]”h&]”Œcolwidth”Kuh1j³hj°ubj´)”}”(hhh]”h}”(h]”h ]”h"]”h$]”h&]”Œcolwidth”K uh1j³hj°ubhŒthead”“”)”}”(hhh]”hŒrow”“”)”}”(hhh]”(hŒentry”“”)”}”(hhh]”hé)”}”(hŒ``md device no.``”h]”j‡)”}”(hjÚh]”hŒ md device no.”…””}”(hhhjÜhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j†hjØubah}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h K hjÕubah}”(h]”h ]”h"]”h$]”h&]”uh1jÓhjÐubjÔ)”}”(hhh]”hé)”}”(hŒdevice”h]”hŒdevice”…””}”(hjúhjøhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h K hjõubah}”(h]”h ]”h"]”h$]”h&]”uh1jÓhjÐubeh}”(h]”h ]”h"]”h$]”h&]”uh1jÎhjËubah}”(h]”h ]”h"]”h$]”h&]”uh1jÉhj°ubhŒtbody”“”)”}”(hhh]”(jÏ)”}”(hhh]”(jÔ)”}”(hhh]”hé)”}”(hŒ0”h]”hŒ0”…””}”(hj%hj#hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h K"hj ubah}”(h]”h ]”h"]”h$]”h&]”uh1jÓhjubjÔ)”}”(hhh]”hé)”}”(hŒmd0”h]”hŒmd0”…””}”(hj<hj:hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h K"hj7ubah}”(h]”h ]”h"]”h$]”h&]”uh1jÓhjubeh}”(h]”h ]”h"]”h$]”h&]”uh1jÎhjubjÏ)”}”(hhh]”(jÔ)”}”(hhh]”hé)”}”(hŒ1”h]”hŒ1”…””}”(hj\hjZhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h K#hjWubah}”(h]”h ]”h"]”h$]”h&]”uh1jÓhjTubjÔ)”}”(hhh]”hé)”}”(hŒmd1”h]”hŒmd1”…””}”(hjshjqhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h K#hjnubah}”(h]”h ]”h"]”h$]”h&]”uh1jÓhjTubeh}”(h]”h ]”h"]”h$]”h&]”uh1jÎhjubjÏ)”}”(hhh]”(jÔ)”}”(hhh]”hé)”}”(hŒ2”h]”hŒ2”…””}”(hj“hj‘hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h K$hjŽubah}”(h]”h ]”h"]”h$]”h&]”uh1jÓhj‹ubjÔ)”}”(hhh]”hé)”}”(hŒmd2”h]”hŒmd2”…””}”(hjªhj¨hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h K$hj¥ubah}”(h]”h ]”h"]”h$]”h&]”uh1jÓhj‹ubeh}”(h]”h ]”h"]”h$]”h&]”uh1jÎhjubjÏ)”}”(hhh]”(jÔ)”}”(hhh]”hé)”}”(hŒ3”h]”hŒ3”…””}”(hjÊhjÈhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h K%hjÅubah}”(h]”h ]”h"]”h$]”h&]”uh1jÓhjÂubjÔ)”}”(hhh]”hé)”}”(hŒmd3”h]”hŒmd3”…””}”(hjáhjßhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h K%hjÜubah}”(h]”h ]”h"]”h$]”h&]”uh1jÓhjÂubeh}”(h]”h ]”h"]”h$]”h&]”uh1jÎhjubjÏ)”}”(hhh]”(jÔ)”}”(hhh]”hé)”}”(hŒ4”h]”hŒ4”…””}”(hjhjÿhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h K&hjüubah}”(h]”h ]”h"]”h$]”h&]”uh1jÓhjùubjÔ)”}”(hhh]”hé)”}”(hŒmd4”h]”hŒmd4”…””}”(hjhjhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h K&hjubah}”(h]”h ]”h"]”h$]”h&]”uh1jÓhjùubeh}”(h]”h ]”h"]”h$]”h&]”uh1jÎhjubeh}”(h]”h ]”h"]”h$]”h&]”uh1jhj°ubeh}”(h]”h ]”h"]”h$]”h&]”Œcols”Kuh1j®hj«ubah}”(h]”h ]”h"]”h$]”h&]”uh1j©hjhžhhŸh¶h Nubeh}”(h]”Œmd-device-no”ah ]”h"]”Œ md device no.”ah$]”h&]”uh1h¡hh·hžhhŸh¶h Kubh¢)”}”(hhh]”(h§)”}”(hŒ``raid level``”h]”j‡)”}”(hjPh]”hŒ raid level”…””}”(hhhjRhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j†hjNubah}”(h]”h ]”h"]”h$]”h&]”uh1h¦hjKhžhhŸh¶h K*ubhé)”}”(hŒlevel of the RAID array”h]”hŒlevel of the RAID array”…””}”(hjghjehžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h K,hjKhžhubjª)”}”(hhh]”j¯)”}”(hhh]”(j´)”}”(hhh]”h}”(h]”h ]”h"]”h$]”h&]”Œcolwidth”Kuh1j³hjvubj´)”}”(hhh]”h}”(h]”h ]”h"]”h$]”h&]”Œcolwidth”K uh1j³hjvubjÊ)”}”(hhh]”jÏ)”}”(hhh]”(jÔ)”}”(hhh]”hé)”}”(hŒ``raid level``”h]”j‡)”}”(hj˜h]”hŒ raid level”…””}”(hhhjšhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j†hj–ubah}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h K/hj“ubah}”(h]”h ]”h"]”h$]”h&]”uh1jÓhjubjÔ)”}”(hhh]”hé)”}”(hŒlevel”h]”hŒlevel”…””}”(hj¸hj¶hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h K/hj³ubah}”(h]”h ]”h"]”h$]”h&]”uh1jÓhjubeh}”(h]”h ]”h"]”h$]”h&]”uh1jÎhjubah}”(h]”h ]”h"]”h$]”h&]”uh1jÉhjvubj)”}”(hhh]”(jÏ)”}”(hhh]”(jÔ)”}”(hhh]”hé)”}”(hŒ-1”h]”hŒ-1”…””}”(hjáhjßhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h K1hjÜubah}”(h]”h ]”h"]”h$]”h&]”uh1jÓhjÙubjÔ)”}”(hhh]”hé)”}”(hŒlinear mode”h]”hŒlinear mode”…””}”(hjøhjöhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h K1hjóubah}”(h]”h ]”h"]”h$]”h&]”uh1jÓhjÙubeh}”(h]”h ]”h"]”h$]”h&]”uh1jÎhjÖubjÏ)”}”(hhh]”(jÔ)”}”(hhh]”hé)”}”(hj%h]”hŒ0”…””}”(hj%hjhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h K2hjubah}”(h]”h ]”h"]”h$]”h&]”uh1jÓhjubjÔ)”}”(hhh]”hé)”}”(hŒstriped mode”h]”hŒstriped mode”…””}”(hj.hj,hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h K2hj)ubah}”(h]”h ]”h"]”h$]”h&]”uh1jÓhjubeh}”(h]”h ]”h"]”h$]”h&]”uh1jÎhjÖubeh}”(h]”h ]”h"]”h$]”h&]”uh1jhjvubeh}”(h]”h ]”h"]”h$]”h&]”Œcols”Kuh1j®hjsubah}”(h]”h ]”h"]”h$]”h&]”uh1j©hjKhžhhŸh¶h Nubhé)”}”(hŒ;other modes are only supported with persistent super blocks”h]”hŒ;other modes are only supported with persistent super blocks”…””}”(hj[hjYhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h K5hjKhžhubeh}”(h]”Œ raid-level”ah ]”h"]”Œ raid level”ah$]”h&]”uh1h¡hh·hžhhŸh¶h K*ubh¢)”}”(hhh]”(h§)”}”(hŒ``chunk size factor``”h]”j‡)”}”(hjth]”hŒchunk size factor”…””}”(hhhjvhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j†hjrubah}”(h]”h ]”h"]”h$]”h&]”uh1h¦hjohžhhŸh¶h K8ubhé)”}”(hŒ(raid-0 and raid-1 only)”h]”hŒ(raid-0 and raid-1 only)”…””}”(hj‹hj‰hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h K:hjohžhubhé)”}”(hŒSet the chunk size as 4k << n.”h]”hŒSet the chunk size as 4k << n.”…””}”(hj™hj—hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h K) looks like this::”h]”(hŒ'A possible loadlin line (Harald Hoyer <”…””}”(hŒ'A possible loadlin line (Harald Hoyer <”hj`hžhhŸNh Nubhï)”}”(hŒHarryH@Royal.Net”h]”hŒHarryH@Royal.Net”…””}”(hhhjihžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”Œrefuri”Œmailto:HarryH@Royal.Net”uh1hîhj`ubhŒ>) looks like this:”…””}”(hŒ>) looks like this:”hj`hžhhŸNh Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h KHhjÝhžhubj4)”}”(hŒLe:\loadlin\loadlin e:\zimage root=/dev/md0 md=0,0,4,0,/dev/hdb2,/dev/hdc3 ro”h]”hŒLe:\loadlin\loadlin e:\zimage root=/dev/md0 md=0,0,4,0,/dev/hdb2,/dev/hdc3 ro”…””}”(hhhj„ubah}”(h]”h ]”h"]”h$]”h&]”jCjDuh1j3hŸh¶h KJhjÝhžhubeh}”(h]”Œdev0-to-devn”ah ]”h"]”Œdev0 to devn”ah$]”h&]”uh1h¡hh·hžhhŸh¶h KDubeh}”(h]”Œ!boot-time-assembly-of-raid-arrays”ah ]”h"]”Œ!boot time assembly of raid arrays”ah$]”h&]”uh1h¡hh£hžhhŸh¶h Kubh¢)”}”(hhh]”(h§)”}”(hŒ&Boot time autodetection of RAID arrays”h]”hŒ&Boot time autodetection of RAID arrays”…””}”(hj§hj¥hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h¦hj¢hžhhŸh¶h KNubhé)”}”(hX@When md is compiled into the kernel (not as module), partitions of type 0xfd are scanned and automatically assembled into RAID arrays. This autodetection may be suppressed with the kernel parameter ``raid=noautodetect``. As of kernel 2.6.9, only drives with a type 0 superblock can be autodetected and run at boot time.”h]”(hŒÆWhen md is compiled into the kernel (not as module), partitions of type 0xfd are scanned and automatically assembled into RAID arrays. This autodetection may be suppressed with the kernel parameter ”…””}”(hŒÆWhen md is compiled into the kernel (not as module), partitions of type 0xfd are scanned and automatically assembled into RAID arrays. This autodetection may be suppressed with the kernel parameter ”hj³hžhhŸNh Nubj‡)”}”(hŒ``raid=noautodetect``”h]”hŒraid=noautodetect”…””}”(hhhj¼hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j†hj³ubhŒe. As of kernel 2.6.9, only drives with a type 0 superblock can be autodetected and run at boot time.”…””}”(hŒe. As of kernel 2.6.9, only drives with a type 0 superblock can be autodetected and run at boot time.”hj³hžhhŸNh Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h KPhj¢hžhubhé)”}”(hŒ‚The kernel parameter ``raid=partitionable`` (or ``raid=part``) means that all auto-detected arrays are assembled as partitionable.”h]”(hŒThe kernel parameter ”…””}”(hŒThe kernel parameter ”hjÕhžhhŸNh Nubj‡)”}”(hŒ``raid=partitionable``”h]”hŒraid=partitionable”…””}”(hhhjÞhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j†hjÕubhŒ (or ”…””}”(hŒ (or ”hjÕhžhhŸNh Nubj‡)”}”(hŒ ``raid=part``”h]”hŒ raid=part”…””}”(hhhjñhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j†hjÕubhŒE) means that all auto-detected arrays are assembled as partitionable.”…””}”(hŒE) means that all auto-detected arrays are assembled as partitionable.”hjÕhžhhŸNh Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h KVhj¢hžhubeh}”(h]”Œ&boot-time-autodetection-of-raid-arrays”ah ]”h"]”Œ&boot time autodetection of raid arrays”ah$]”h&]”uh1h¡hh£hžhhŸh¶h KNubh¢)”}”(hhh]”(h§)”}”(hŒ+Boot time assembly of degraded/dirty arrays”h]”hŒ+Boot time assembly of degraded/dirty arrays”…””}”(hjhjhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h¦hjhžhhŸh¶h KZubhé)”}”(hX:If a raid5 or raid6 array is both dirty and degraded, it could have undetectable data corruption. This is because the fact that it is ``dirty`` means that the parity cannot be trusted, and the fact that it is degraded means that some datablocks are missing and cannot reliably be reconstructed (due to no parity).”h]”(hŒ‡If a raid5 or raid6 array is both dirty and degraded, it could have undetectable data corruption. This is because the fact that it is ”…””}”(hŒ‡If a raid5 or raid6 array is both dirty and degraded, it could have undetectable data corruption. This is because the fact that it is ”hj#hžhhŸNh Nubj‡)”}”(hŒ ``dirty``”h]”hŒdirty”…””}”(hhhj,hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j†hj#ubhŒª means that the parity cannot be trusted, and the fact that it is degraded means that some datablocks are missing and cannot reliably be reconstructed (due to no parity).”…””}”(hŒª means that the parity cannot be trusted, and the fact that it is degraded means that some datablocks are missing and cannot reliably be reconstructed (due to no parity).”hj#hžhhŸNh Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h K\hjhžhubhé)”}”(hŒÄFor this reason, md will normally refuse to start such an array. This requires the sysadmin to take action to explicitly start the array despite possible corruption. This is normally done with::”h]”hŒÃFor this reason, md will normally refuse to start such an array. This requires the sysadmin to take action to explicitly start the array despite possible corruption. This is normally done with:”…””}”(hŒÃFor this reason, md will normally refuse to start such an array. This requires the sysadmin to take action to explicitly start the array despite possible corruption. This is normally done with:”hjEhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h Kbhjhžhubj4)”}”(hŒmdadm --assemble --force ....”h]”hŒmdadm --assemble --force ....”…””}”(hhhjTubah}”(h]”h ]”h"]”h$]”h&]”jCjDuh1j3hŸh¶h Kfhjhžhubhé)”}”(hXThis option is not really available if the array has the root filesystem on it. In order to support this booting from such an array, md supports a module parameter ``start_dirty_degraded`` which, when set to 1, bypassed the checks and will allows dirty degraded arrays to be started.”h]”(hŒ¥This option is not really available if the array has the root filesystem on it. In order to support this booting from such an array, md supports a module parameter ”…””}”(hŒ¥This option is not really available if the array has the root filesystem on it. In order to support this booting from such an array, md supports a module parameter ”hjbhžhhŸNh Nubj‡)”}”(hŒ``start_dirty_degraded``”h]”hŒstart_dirty_degraded”…””}”(hhhjkhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j†hjbubhŒ_ which, when set to 1, bypassed the checks and will allows dirty degraded arrays to be started.”…””}”(hŒ_ which, when set to 1, bypassed the checks and will allows dirty degraded arrays to be started.”hjbhžhhŸNh Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h Khhjhžhubhé)”}”(hŒISo, to boot with a root filesystem of a dirty degraded raid 5 or 6, use::”h]”hŒHSo, to boot with a root filesystem of a dirty degraded raid 5 or 6, use:”…””}”(hŒHSo, to boot with a root filesystem of a dirty degraded raid 5 or 6, use:”hj„hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h Knhjhžhubj4)”}”(hŒmd-mod.start_dirty_degraded=1”h]”hŒmd-mod.start_dirty_degraded=1”…””}”(hhhj“ubah}”(h]”h ]”h"]”h$]”h&]”jCjDuh1j3hŸh¶h Kphjhžhubeh}”(h]”Œ+boot-time-assembly-of-degraded-dirty-arrays”ah ]”h"]”Œ+boot time assembly of degraded/dirty arrays”ah$]”h&]”uh1h¡hh£hžhhŸh¶h KZubh¢)”}”(hhh]”(h§)”}”(hŒSuperblock formats”h]”hŒSuperblock formats”…””}”(hj®hj¬hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h¦hj©hžhhŸh¶h Ktubhé)”}”(hŒ»The md driver can support a variety of different superblock formats. Currently, it supports superblock formats ``0.90.0`` and the ``md-1`` format introduced in the 2.5 development series.”h]”(hŒoThe md driver can support a variety of different superblock formats. Currently, it supports superblock formats ”…””}”(hŒoThe md driver can support a variety of different superblock formats. Currently, it supports superblock formats ”hjºhžhhŸNh Nubj‡)”}”(hŒ ``0.90.0``”h]”hŒ0.90.0”…””}”(hhhjÃhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j†hjºubhŒ and the ”…””}”(hŒ and the ”hjºhžhhŸNh Nubj‡)”}”(hŒ``md-1``”h]”hŒmd-1”…””}”(hhhjÖhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j†hjºubhŒ1 format introduced in the 2.5 development series.”…””}”(hŒ1 format introduced in the 2.5 development series.”hjºhžhhŸNh Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h Kvhj©hžhubhé)”}”(hŒAThe kernel will autodetect which format superblock is being used.”h]”hŒAThe kernel will autodetect which format superblock is being used.”…””}”(hjñhjïhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h Kzhj©hžhubhé)”}”(hŒsSuperblock format ``0`` is treated differently to others for legacy reasons - it is the original superblock format.”h]”(hŒSuperblock format ”…””}”(hŒSuperblock format ”hjýhžhhŸNh Nubj‡)”}”(hŒ``0``”h]”hŒ0”…””}”(hhhjhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j†hjýubhŒ\ is treated differently to others for legacy reasons - it is the original superblock format.”…””}”(hŒ\ is treated differently to others for legacy reasons - it is the original superblock format.”hjýhžhhŸNh Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h K|hj©hžhubeh}”(h]”Œsuperblock-formats”ah ]”h"]”Œsuperblock formats”ah$]”h&]”uh1h¡hh£hžhhŸh¶h Ktubh¢)”}”(hhh]”(h§)”}”(hŒ0General Rules - apply for all superblock formats”h]”hŒ0General Rules - apply for all superblock formats”…””}”(hj,hj*hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h¦hj'hžhhŸh¶h Kubhé)”}”(hŒJAn array is ``created`` by writing appropriate superblocks to all devices.”h]”(hŒAn array is ”…””}”(hŒAn array is ”hj8hžhhŸNh Nubj‡)”}”(hŒ``created``”h]”hŒcreated”…””}”(hhhjAhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j†hj8ubhŒ3 by writing appropriate superblocks to all devices.”…””}”(hŒ3 by writing appropriate superblocks to all devices.”hj8hžhhŸNh Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h Kƒhj'hžhubhé)”}”(hŒ”It is ``assembled`` by associating each of these devices with an particular md virtual device. Once it is completely assembled, it can be accessed.”h]”(hŒIt is ”…””}”(hŒIt is ”hjZhžhhŸNh Nubj‡)”}”(hŒ ``assembled``”h]”hŒ assembled”…””}”(hhhjchžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j†hjZubhŒ by associating each of these devices with an particular md virtual device. Once it is completely assembled, it can be accessed.”…””}”(hŒ by associating each of these devices with an particular md virtual device. Once it is completely assembled, it can be accessed.”hjZhžhhŸNh Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h K†hj'hžhubhé)”}”(hXAn array should be created by a user-space tool. This will write superblocks to all devices. It will usually mark the array as ``unclean``, or with some devices missing so that the kernel md driver can create appropriate redundancy (copying in raid 1, parity calculation in raid 4/5).”h]”(hŒAn array should be created by a user-space tool. This will write superblocks to all devices. It will usually mark the array as ”…””}”(hŒAn array should be created by a user-space tool. This will write superblocks to all devices. It will usually mark the array as ”hj|hžhhŸNh Nubj‡)”}”(hŒ``unclean``”h]”hŒunclean”…””}”(hhhj…hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j†hj|ubhŒ’, or with some devices missing so that the kernel md driver can create appropriate redundancy (copying in raid 1, parity calculation in raid 4/5).”…””}”(hŒ’, or with some devices missing so that the kernel md driver can create appropriate redundancy (copying in raid 1, parity calculation in raid 4/5).”hj|hžhhŸNh Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h KŠhj'hžhubhé)”}”(hX`When an array is assembled, it is first initialized with the SET_ARRAY_INFO ioctl. This contains, in particular, a major and minor version number. The major version number selects which superblock format is to be used. The minor number might be used to tune handling of the format, such as suggesting where on each device to look for the superblock.”h]”hX`When an array is assembled, it is first initialized with the SET_ARRAY_INFO ioctl. This contains, in particular, a major and minor version number. The major version number selects which superblock format is to be used. The minor number might be used to tune handling of the format, such as suggesting where on each device to look for the superblock.”…””}”(hj hjžhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h Khj'hžhubhé)”}”(hŒŽThen each device is added using the ADD_NEW_DISK ioctl. This provides, in particular, a major and minor number identifying the device to add.”h]”hŒŽThen each device is added using the ADD_NEW_DISK ioctl. This provides, in particular, a major and minor number identifying the device to add.”…””}”(hj®hj¬hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h K—hj'hžhubhé)”}”(hŒ.The array is started with the RUN_ARRAY ioctl.”h]”hŒ.The array is started with the RUN_ARRAY ioctl.”…””}”(hj¼hjºhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h K›hj'hžhubhé)”}”(hŒOnce started, new devices can be added. They should have an appropriate superblock written to them, and then be passed in with ADD_NEW_DISK.”h]”hŒOnce started, new devices can be added. They should have an appropriate superblock written to them, and then be passed in with ADD_NEW_DISK.”…””}”(hjÊhjÈhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h Khj'hžhubhé)”}”(hŒcDevices that have failed or are not yet active can be detached from an array using HOT_REMOVE_DISK.”h]”hŒcDevices that have failed or are not yet active can be detached from an array using HOT_REMOVE_DISK.”…””}”(hjØhjÖhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h K¡hj'hžhubeh}”(h]”Œ.general-rules-apply-for-all-superblock-formats”ah ]”h"]”Œ0general rules - apply for all superblock formats”ah$]”h&]”uh1h¡hh£hžhhŸh¶h Kubh¢)”}”(hhh]”(h§)”}”(hŒhSpecific Rules that apply to format-0 super block arrays, and arrays with no superblock (non-persistent)”h]”hŒhSpecific Rules that apply to format-0 super block arrays, and arrays with no superblock (non-persistent)”…””}”(hjñhjïhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h¦hjìhžhhŸh¶h K¦ubhé)”}”(hŒ£An array can be ``created`` by describing the array (level, chunksize etc) in a SET_ARRAY_INFO ioctl. This must have ``major_version==0`` and ``raid_disks != 0``.”h]”(hŒAn array can be ”…””}”(hŒAn array can be ”hjýhžhhŸNh Nubj‡)”}”(hŒ``created``”h]”hŒcreated”…””}”(hhhjhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j†hjýubhŒ[ by describing the array (level, chunksize etc) in a SET_ARRAY_INFO ioctl. This must have ”…””}”(hŒ[ by describing the array (level, chunksize etc) in a SET_ARRAY_INFO ioctl. This must have ”hjýhžhhŸNh Nubj‡)”}”(hŒ``major_version==0``”h]”hŒmajor_version==0”…””}”(hhhjhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j†hjýubhŒ and ”…””}”(hŒ and ”hjýhžhhŸNh Nubj‡)”}”(hŒ``raid_disks != 0``”h]”hŒraid_disks != 0”…””}”(hhhj,hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j†hjýubhŒ.”…””}”(hŒ.”hjýhžhhŸNh Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h K¨hjìhžhubhé)”}”(hŒ Then uninitialized devices can be added with ADD_NEW_DISK. The structure passed to ADD_NEW_DISK must specify the state of the device and its role in the array.”h]”hŒ Then uninitialized devices can be added with ADD_NEW_DISK. The structure passed to ADD_NEW_DISK must specify the state of the device and its role in the array.”…””}”(hjGhjEhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h K¬hjìhžhubhé)”}”(hŒQOnce started with RUN_ARRAY, uninitialized spares can be added with HOT_ADD_DISK.”h]”hŒQOnce started with RUN_ARRAY, uninitialized spares can be added with HOT_ADD_DISK.”…””}”(hjUhjShžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h K°hjìhžhubeh}”(h]”Œespecific-rules-that-apply-to-format-0-super-block-arrays-and-arrays-with-no-superblock-non-persistent”ah ]”h"]”Œhspecific rules that apply to format-0 super block arrays, and arrays with no superblock (non-persistent)”ah$]”h&]”uh1h¡hh£hžhhŸh¶h K¦ubh¢)”}”(hhh]”(h§)”}”(hŒMD devices in sysfs”h]”hŒMD devices in sysfs”…””}”(hjnhjlhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h¦hjihžhhŸh¶h Kµubhé)”}”(hŒFmd devices appear in sysfs (``/sys``) as regular block devices, e.g.::”h]”(hŒmd devices appear in sysfs (”…””}”(hŒmd devices appear in sysfs (”hjzhžhhŸNh Nubj‡)”}”(hŒ``/sys``”h]”hŒ/sys”…””}”(hhhjƒhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j†hjzubhŒ!) as regular block devices, e.g.:”…””}”(hŒ!) as regular block devices, e.g.:”hjzhžhhŸNh Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h K·hjihžhubj4)”}”(hŒ/sys/block/md0”h]”hŒ/sys/block/md0”…””}”(hhhjœubah}”(h]”h ]”h"]”h$]”h&]”jCjDuh1j3hŸh¶h Kºhjihžhubhé)”}”(hŒ}Each ``md`` device will contain a subdirectory called ``md`` which contains further md-specific information about the device.”h]”(hŒEach ”…””}”(hŒEach ”hjªhžhhŸNh Nubj‡)”}”(hŒ``md``”h]”hŒmd”…””}”(hhhj³hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j†hjªubhŒ+ device will contain a subdirectory called ”…””}”(hŒ+ device will contain a subdirectory called ”hjªhžhhŸNh Nubj‡)”}”(hŒ``md``”h]”hŒmd”…””}”(hhhjÆhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j†hjªubhŒA which contains further md-specific information about the device.”…””}”(hŒA which contains further md-specific information about the device.”hjªhžhhŸNh Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h K¼hjihžhubhé)”}”(hŒAll md devices contain:”h]”hŒAll md devices contain:”…””}”(hjáhjßhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h K¿hjihžhubhŒblock_quote”“”)”}”(hhh]”hÉ)”}”(hhh]”(hÎ)”}”(hX4level a text file indicating the ``raid level``. e.g. raid0, raid1, raid5, linear, multipath, faulty. If no raid level has been set yet (array is still being assembled), the value will reflect whatever has been written to it, which may be a name like the above, or may be a number such as ``0``, ``5``, etc. ”h]”(hÔ)”}”(hŒlevel”h]”hŒlevel”…””}”(hjûhjùhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÓhŸh¶h KÇhjõubhä)”}”(hhh]”hé)”}”(hX-a text file indicating the ``raid level``. e.g. raid0, raid1, raid5, linear, multipath, faulty. If no raid level has been set yet (array is still being assembled), the value will reflect whatever has been written to it, which may be a name like the above, or may be a number such as ``0``, ``5``, etc.”h]”(hŒa text file indicating the ”…””}”(hŒa text file indicating the ”hj hžhhŸNh Nubj‡)”}”(hŒ``raid level``”h]”hŒ raid level”…””}”(hhhj hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j†hj ubhŒò. e.g. raid0, raid1, raid5, linear, multipath, faulty. If no raid level has been set yet (array is still being assembled), the value will reflect whatever has been written to it, which may be a name like the above, or may be a number such as ”…””}”(hŒò. e.g. raid0, raid1, raid5, linear, multipath, faulty. If no raid level has been set yet (array is still being assembled), the value will reflect whatever has been written to it, which may be a name like the above, or may be a number such as ”hj hžhhŸNh Nubj‡)”}”(hŒ``0``”h]”hŒ0”…””}”(hhhj& hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j†hj ubhŒ, ”…””}”(hŒ, ”hj hžhhŸNh Nubj‡)”}”(hŒ``5``”h]”hŒ5”…””}”(hhhj9 hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j†hj ubhŒ, etc.”…””}”(hŒ, etc.”hj hžhhŸNh Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h KÂhj ubah}”(h]”h ]”h"]”h$]”h&]”uh1hãhjõubeh}”(h]”h ]”h"]”h$]”h&]”uh1hÍhŸh¶h KÇhjòubhÎ)”}”(hXfraid_disks a text file with a simple number indicating the number of devices in a fully functional array. If this is not yet known, the file will be empty. If an array is being resized this will contain the new number of devices. Some raid levels allow this value to be set while the array is active. This will reconfigure the array. Otherwise it can only be set while assembling an array. A change to this attribute will not be permitted if it would reduce the size of the array. To reduce the number of drives in an e.g. raid5, the array size must first be reduced by setting the ``array_size`` attribute. ”h]”(hÔ)”}”(hŒ raid_disks”h]”hŒ raid_disks”…””}”(hjd hjb hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÓhŸh¶h KÔhj^ ubhä)”}”(hhh]”hé)”}”(hXZa text file with a simple number indicating the number of devices in a fully functional array. If this is not yet known, the file will be empty. If an array is being resized this will contain the new number of devices. Some raid levels allow this value to be set while the array is active. This will reconfigure the array. Otherwise it can only be set while assembling an array. A change to this attribute will not be permitted if it would reduce the size of the array. To reduce the number of drives in an e.g. raid5, the array size must first be reduced by setting the ``array_size`` attribute.”h]”(hXAa text file with a simple number indicating the number of devices in a fully functional array. If this is not yet known, the file will be empty. If an array is being resized this will contain the new number of devices. Some raid levels allow this value to be set while the array is active. This will reconfigure the array. Otherwise it can only be set while assembling an array. A change to this attribute will not be permitted if it would reduce the size of the array. To reduce the number of drives in an e.g. raid5, the array size must first be reduced by setting the ”…””}”(hXAa text file with a simple number indicating the number of devices in a fully functional array. If this is not yet known, the file will be empty. If an array is being resized this will contain the new number of devices. Some raid levels allow this value to be set while the array is active. This will reconfigure the array. Otherwise it can only be set while assembling an array. A change to this attribute will not be permitted if it would reduce the size of the array. To reduce the number of drives in an e.g. raid5, the array size must first be reduced by setting the ”hjs hžhhŸNh Nubj‡)”}”(hŒ``array_size``”h]”hŒ array_size”…””}”(hhhj| hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j†hjs ubhŒ attribute.”…””}”(hŒ attribute.”hjs hžhhŸNh Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h KÊhjp ubah}”(h]”h ]”h"]”h$]”h&]”uh1hãhj^ ubeh}”(h]”h ]”h"]”h$]”h&]”uh1hÍhŸh¶h KÔhjòubhÎ)”}”(hXtchunk_size This is the size in bytes for ``chunks`` and is only relevant to raid levels that involve striping (0,4,5,6,10). The address space of the array is conceptually divided into chunks and consecutive chunks are striped onto neighbouring devices. The size should be at least PAGE_SIZE (4k) and should be a power of 2. This can only be set while assembling an array ”h]”(hÔ)”}”(hŒ chunk_size”h]”hŒ chunk_size”…””}”(hj§ hj¥ hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÓhŸh¶h KÜhj¡ ubhä)”}”(hhh]”hé)”}”(hXhThis is the size in bytes for ``chunks`` and is only relevant to raid levels that involve striping (0,4,5,6,10). The address space of the array is conceptually divided into chunks and consecutive chunks are striped onto neighbouring devices. The size should be at least PAGE_SIZE (4k) and should be a power of 2. This can only be set while assembling an array”h]”(hŒThis is the size in bytes for ”…””}”(hŒThis is the size in bytes for ”hj¶ hžhhŸNh Nubj‡)”}”(hŒ ``chunks``”h]”hŒchunks”…””}”(hhhj¿ hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j†hj¶ ubhX@ and is only relevant to raid levels that involve striping (0,4,5,6,10). The address space of the array is conceptually divided into chunks and consecutive chunks are striped onto neighbouring devices. The size should be at least PAGE_SIZE (4k) and should be a power of 2. This can only be set while assembling an array”…””}”(hX@ and is only relevant to raid levels that involve striping (0,4,5,6,10). The address space of the array is conceptually divided into chunks and consecutive chunks are striped onto neighbouring devices. The size should be at least PAGE_SIZE (4k) and should be a power of 2. This can only be set while assembling an array”hj¶ hžhhŸNh Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h K×hj³ ubah}”(h]”h ]”h"]”h$]”h&]”uh1hãhj¡ ubeh}”(h]”h ]”h"]”h$]”h&]”uh1hÍhŸh¶h KÜhjòubhÎ)”}”(hŒºlayout The ``layout`` for the array for the particular level. This is simply a number that is interpreted differently by different levels. It can be written while assembling an array. ”h]”(hÔ)”}”(hŒlayout”h]”hŒlayout”…””}”(hjê hjè hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÓhŸh¶h Káhjä ubhä)”}”(hhh]”hé)”}”(hŒ²The ``layout`` for the array for the particular level. This is simply a number that is interpreted differently by different levels. It can be written while assembling an array.”h]”(hŒThe ”…””}”(hŒThe ”hjù hžhhŸNh Nubj‡)”}”(hŒ ``layout``”h]”hŒlayout”…””}”(hhhj hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j†hjù ubhŒ¤ for the array for the particular level. This is simply a number that is interpreted differently by different levels. It can be written while assembling an array.”…””}”(hŒ¤ for the array for the particular level. This is simply a number that is interpreted differently by different levels. It can be written while assembling an array.”hjù hžhhŸNh Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h Kßhjö ubah}”(h]”h ]”h"]”h$]”h&]”uh1hãhjä ubeh}”(h]”h ]”h"]”h$]”h&]”uh1hÍhŸh¶h KáhjòubhÎ)”}”(hX¥array_size This can be used to artificially constrain the available space in the array to be less than is actually available on the combined devices. Writing a number (in Kilobytes) which is less than the available size will set the size. Any reconfiguration of the array (e.g. adding devices) will not cause the size to change. Writing the word ``default`` will cause the effective size of the array to be whatever size is actually available based on ``level``, ``chunk_size`` and ``component_size``. This can be used to reduce the size of the array before reducing the number of devices in a raid4/5/6, or to support external metadata formats which mandate such clipping. ”h]”(hÔ)”}”(hŒ array_size”h]”hŒ array_size”…””}”(hj- hj+ hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÓhŸh¶h Kïhj' ubhä)”}”(hhh]”(hé)”}”(hXìThis can be used to artificially constrain the available space in the array to be less than is actually available on the combined devices. Writing a number (in Kilobytes) which is less than the available size will set the size. Any reconfiguration of the array (e.g. adding devices) will not cause the size to change. Writing the word ``default`` will cause the effective size of the array to be whatever size is actually available based on ``level``, ``chunk_size`` and ``component_size``.”h]”(hXQThis can be used to artificially constrain the available space in the array to be less than is actually available on the combined devices. Writing a number (in Kilobytes) which is less than the available size will set the size. Any reconfiguration of the array (e.g. adding devices) will not cause the size to change. Writing the word ”…””}”(hXQThis can be used to artificially constrain the available space in the array to be less than is actually available on the combined devices. Writing a number (in Kilobytes) which is less than the available size will set the size. Any reconfiguration of the array (e.g. adding devices) will not cause the size to change. Writing the word ”hj< hžhhŸNh Nubj‡)”}”(hŒ``default``”h]”hŒdefault”…””}”(hhhjE hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j†hj< ubhŒ_ will cause the effective size of the array to be whatever size is actually available based on ”…””}”(hŒ_ will cause the effective size of the array to be whatever size is actually available based on ”hj< hžhhŸNh Nubj‡)”}”(hŒ ``level``”h]”hŒlevel”…””}”(hhhjX hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j†hj< ubhŒ, ”…””}”(hŒ, ”hj< hžhhŸNh Nubj‡)”}”(hŒ``chunk_size``”h]”hŒ chunk_size”…””}”(hhhjk hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j†hj< ubhŒ and ”…””}”(hŒ and ”hj< hžhhŸNh Nubj‡)”}”(hŒ``component_size``”h]”hŒcomponent_size”…””}”(hhhj~ hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j†hj< ubhŒ.”…””}”(hj>hj< hžhhŸNh Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h Kähj9 ubhé)”}”(hŒ«This can be used to reduce the size of the array before reducing the number of devices in a raid4/5/6, or to support external metadata formats which mandate such clipping.”h]”hŒ«This can be used to reduce the size of the array before reducing the number of devices in a raid4/5/6, or to support external metadata formats which mandate such clipping.”…””}”(hj˜ hj– hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h Kíhj9 ubeh}”(h]”h ]”h"]”h$]”h&]”uh1hãhj' ubeh}”(h]”h ]”h"]”h$]”h&]”uh1hÍhŸh¶h KïhjòubhÎ)”}”(hX˜reshape_position This is either ``none`` or a sector number within the devices of the array where ``reshape`` is up to. If this is set, the three attributes mentioned above (raid_disks, chunk_size, layout) can potentially have 2 values, an old and a new value. If these values differ, reading the attribute returns:: new (old) and writing will effect the ``new`` value, leaving the ``old`` unchanged. ”h]”(hÔ)”}”(hŒreshape_position”h]”hŒreshape_position”…””}”(hj¶ hj´ hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÓhŸh¶h Kûhj° ubhä)”}”(hhh]”(hé)”}”(hX-This is either ``none`` or a sector number within the devices of the array where ``reshape`` is up to. If this is set, the three attributes mentioned above (raid_disks, chunk_size, layout) can potentially have 2 values, an old and a new value. If these values differ, reading the attribute returns::”h]”(hŒThis is either ”…””}”(hŒThis is either ”hjÅ hžhhŸNh Nubj‡)”}”(hŒ``none``”h]”hŒnone”…””}”(hhhjÎ hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j†hjÅ ubhŒ: or a sector number within the devices of the array where ”…””}”(hŒ: or a sector number within the devices of the array where ”hjÅ hžhhŸNh Nubj‡)”}”(hŒ``reshape``”h]”hŒreshape”…””}”(hhhjá hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j†hjÅ ubhŒÐ is up to. If this is set, the three attributes mentioned above (raid_disks, chunk_size, layout) can potentially have 2 values, an old and a new value. If these values differ, reading the attribute returns:”…””}”(hŒÐ is up to. If this is set, the three attributes mentioned above (raid_disks, chunk_size, layout) can potentially have 2 values, an old and a new value. If these values differ, reading the attribute returns:”hjÅ hžhhŸNh Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h KòhjÂ ubj4)”}”(hŒ new (old)”h]”hŒ new (old)”…””}”(hhhjú ubah}”(h]”h ]”h"]”h$]”h&]”jCjDuh1j3hŸh¶h KøhjÂ ubhé)”}”(hŒIand writing will effect the ``new`` value, leaving the ``old`` unchanged.”h]”(hŒand writing will effect the ”…””}”(hŒand writing will effect the ”hjhžhhŸNh Nubj‡)”}”(hŒ``new``”h]”hŒnew”…””}”(hhhjhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j†hjubhŒ value, leaving the ”…””}”(hŒ value, leaving the ”hjhžhhŸNh Nubj‡)”}”(hŒ``old``”h]”hŒold”…””}”(hhhj$hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j†hjubhŒ unchanged.”…””}”(hŒ unchanged.”hjhžhhŸNh Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h KúhjÂ ubeh}”(h]”h ]”h"]”h$]”h&]”uh1hãhj° ubeh}”(h]”h ]”h"]”h$]”h&]”uh1hÍhŸh¶h KûhjòubhÎ)”}”(hXºcomponent_size For arrays with data redundancy (i.e. not raid0, linear, faulty, multipath), all components must be the same size - or at least there must a size that they all provide space for. This is a key part or the geometry of the array. It is measured in sectors and can be read from here. Writing to this value may resize the array if the personality supports it (raid1, raid5, raid6), and if the component drives are large enough. ”h]”(hÔ)”}”(hŒcomponent_size”h]”hŒcomponent_size”…””}”(hjOhjMhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÓhŸh¶h MhjIubhä)”}”(hhh]”hé)”}”(hXªFor arrays with data redundancy (i.e. not raid0, linear, faulty, multipath), all components must be the same size - or at least there must a size that they all provide space for. This is a key part or the geometry of the array. It is measured in sectors and can be read from here. Writing to this value may resize the array if the personality supports it (raid1, raid5, raid6), and if the component drives are large enough.”h]”hXªFor arrays with data redundancy (i.e. not raid0, linear, faulty, multipath), all components must be the same size - or at least there must a size that they all provide space for. This is a key part or the geometry of the array. It is measured in sectors and can be read from here. Writing to this value may resize the array if the personality supports it (raid1, raid5, raid6), and if the component drives are large enough.”…””}”(hj`hj^hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h Kþhj[ubah}”(h]”h ]”h"]”h$]”h&]”uh1hãhjIubeh}”(h]”h ]”h"]”h$]”h&]”uh1hÍhŸh¶h MhjòubhÎ)”}”(hX&metadata_version This indicates the format that is being used to record metadata about the array. It can be 0.90 (traditional format), 1.0, 1.1, 1.2 (newer format in varying locations) or ``none`` indicating that the kernel isn't managing metadata at all. Alternately it can be ``external:`` followed by a string which is set by user-space. This indicates that metadata is managed by a user-space program. Any device failure or other event that requires a metadata update will cause array activity to be suspended until the event is acknowledged. ”h]”(hÔ)”}”(hŒmetadata_version”h]”hŒmetadata_version”…””}”(hj~hj|hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÓhŸh¶h Mhjxubhä)”}”(hhh]”hé)”}”(hXThis indicates the format that is being used to record metadata about the array. It can be 0.90 (traditional format), 1.0, 1.1, 1.2 (newer format in varying locations) or ``none`` indicating that the kernel isn't managing metadata at all. Alternately it can be ``external:`` followed by a string which is set by user-space. This indicates that metadata is managed by a user-space program. Any device failure or other event that requires a metadata update will cause array activity to be suspended until the event is acknowledged.”h]”(hŒ¬This indicates the format that is being used to record metadata about the array. It can be 0.90 (traditional format), 1.0, 1.1, 1.2 (newer format in varying locations) or ”…””}”(hŒ¬This indicates the format that is being used to record metadata about the array. It can be 0.90 (traditional format), 1.0, 1.1, 1.2 (newer format in varying locations) or ”hjhžhhŸNh Nubj‡)”}”(hŒ``none``”h]”hŒnone”…””}”(hhhj–hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j†hjubhŒT indicating that the kernel isnâ€™t managing metadata at all. Alternately it can be ”…””}”(hŒR indicating that the kernel isn't managing metadata at all. Alternately it can be ”hjhžhhŸNh Nubj‡)”}”(hŒ ``external:``”h]”hŒ external:”…””}”(hhhj©hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j†hjubhX followed by a string which is set by user-space. This indicates that metadata is managed by a user-space program. Any device failure or other event that requires a metadata update will cause array activity to be suspended until the event is acknowledged.”…””}”(hX followed by a string which is set by user-space. This indicates that metadata is managed by a user-space program. Any device failure or other event that requires a metadata update will cause array activity to be suspended until the event is acknowledged.”hjhžhhŸNh Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h MhjŠubah}”(h]”h ]”h"]”h$]”h&]”uh1hãhjxubeh}”(h]”h ]”h"]”h$]”h&]”uh1hÍhŸh¶h MhjòubhÎ)”}”(hŒøresync_start The point at which resync should start. If no resync is needed, this will be a very large number (or ``none`` since 2.6.30-rc1). At array creation it will default to 0, though starting the array as ``clean`` will set it much larger. ”h]”(hÔ)”}”(hŒresync_start”h]”hŒresync_start”…””}”(hjÔhjÒhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÓhŸh¶h MhjÎubhä)”}”(hhh]”hé)”}”(hŒêThe point at which resync should start. If no resync is needed, this will be a very large number (or ``none`` since 2.6.30-rc1). At array creation it will default to 0, though starting the array as ``clean`` will set it much larger.”h]”(hŒfThe point at which resync should start. If no resync is needed, this will be a very large number (or ”…””}”(hŒfThe point at which resync should start. If no resync is needed, this will be a very large number (or ”hjãhžhhŸNh Nubj‡)”}”(hŒ``none``”h]”hŒnone”…””}”(hhhjìhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j†hjãubhŒZ since 2.6.30-rc1). At array creation it will default to 0, though starting the array as ”…””}”(hŒZ since 2.6.30-rc1). At array creation it will default to 0, though starting the array as ”hjãhžhhŸNh Nubj‡)”}”(hŒ ``clean``”h]”hŒclean”…””}”(hhhjÿhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j†hjãubhŒ will set it much larger.”…””}”(hŒ will set it much larger.”hjãhžhhŸNh Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h Mhjàubah}”(h]”h ]”h"]”h$]”h&]”uh1hãhjÎubeh}”(h]”h ]”h"]”h$]”h&]”uh1hÍhŸh¶h MhjòubhÎ)”}”(hX>new_dev This file can be written but not read. The value written should be a block device number as major:minor. e.g. 8:0 This will cause that device to be attached to the array, if it is available. It will then appear at md/dev-XXX (depending on the name of the device) and further configuration is then possible. ”h]”(hÔ)”}”(hŒnew_dev”h]”hŒnew_dev”…””}”(hj*hj(hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÓhŸh¶h Mhj$ubhä)”}”(hhh]”hé)”}”(hX5This file can be written but not read. The value written should be a block device number as major:minor. e.g. 8:0 This will cause that device to be attached to the array, if it is available. It will then appear at md/dev-XXX (depending on the name of the device) and further configuration is then possible.”h]”hX5This file can be written but not read. The value written should be a block device number as major:minor. e.g. 8:0 This will cause that device to be attached to the array, if it is available. It will then appear at md/dev-XXX (depending on the name of the device) and further configuration is then possible.”…””}”(hj;hj9hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h Mhj6ubah}”(h]”h ]”h"]”h$]”h&]”uh1hãhj$ubeh}”(h]”h ]”h"]”h$]”h&]”uh1hÍhŸh¶h MhjòubhÎ)”}”(hX¨safe_mode_delay When an md array has seen no write requests for a certain period of time, it will be marked as ``clean``. When another write request arrives, the array is marked as ``dirty`` before the write commences. This is known as ``safe_mode``. The ``certain period`` is controlled by this file which stores the period as a number of seconds. The default is 200msec (0.200). Writing a value of 0 disables safemode. ”h]”(hÔ)”}”(hŒsafe_mode_delay”h]”hŒsafe_mode_delay”…””}”(hjYhjWhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÓhŸh¶h M%hjSubhä)”}”(hhh]”hé)”}”(hX—When an md array has seen no write requests for a certain period of time, it will be marked as ``clean``. When another write request arrives, the array is marked as ``dirty`` before the write commences. This is known as ``safe_mode``. The ``certain period`` is controlled by this file which stores the period as a number of seconds. The default is 200msec (0.200). Writing a value of 0 disables safemode.”h]”(hŒ_When an md array has seen no write requests for a certain period of time, it will be marked as ”…””}”(hŒ_When an md array has seen no write requests for a certain period of time, it will be marked as ”hjhhžhhŸNh Nubj‡)”}”(hŒ ``clean``”h]”hŒclean”…””}”(hhhjqhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j†hjhubhŒ>. When another write request arrives, the array is marked as ”…””}”(hŒ>. When another write request arrives, the array is marked as ”hjhhžhhŸNh Nubj‡)”}”(hŒ ``dirty``”h]”hŒdirty”…””}”(hhhj„hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j†hjhubhŒ/ before the write commences. This is known as ”…””}”(hŒ/ before the write commences. This is known as ”hjhhžhhŸNh Nubj‡)”}”(hŒ ``safe_mode``”h]”hŒ safe_mode”…””}”(hhhj—hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j†hjhubhŒ. The ”…””}”(hŒ. The ”hjhhžhhŸNh Nubj‡)”}”(hŒ``certain period``”h]”hŒcertain period”…””}”(hhhjªhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j†hjhubhŒ” is controlled by this file which stores the period as a number of seconds. The default is 200msec (0.200). Writing a value of 0 disables safemode.”…””}”(hŒ” is controlled by this file which stores the period as a number of seconds. The default is 200msec (0.200). Writing a value of 0 disables safemode.”hjhhžhhŸNh Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h Mhjeubah}”(h]”h ]”h"]”h$]”h&]”uh1hãhjSubeh}”(h]”h ]”h"]”h$]”h&]”uh1hÍhŸh¶h M%hjòubhÎ)”}”(hXarray_state This file contains a single word which describes the current state of the array. In many cases, the state can be set by writing the word for the desired state, however some states cannot be explicitly set, and some transitions are not allowed. Select/poll works on this file. All changes except between Active_idle and active (which can be frequent and are not very interesting) are notified. active->active_idle is reported if the metadata is externally managed. clear No devices, no size, no level Writing is equivalent to STOP_ARRAY ioctl inactive May have some settings, but array is not active all IO results in error When written, doesn't tear down array, but just stops it suspended (not supported yet) All IO requests will block. The array can be reconfigured. Writing this, if accepted, will block until array is quiescent readonly no resync can happen. no superblocks get written. Write requests fail read-auto like readonly, but behaves like ``clean`` on a write request. clean no pending writes, but otherwise active. When written to inactive array, starts without resync If a write request arrives then if metadata is known, mark ``dirty`` and switch to ``active``. if not known, block and switch to write-pending If written to an active array that has pending writes, then fails. active fully active: IO and resync can be happening. When written to inactive array, starts with resync write-pending clean, but writes are blocked waiting for ``active`` to be written. active-idle like active, but no writes have been seen for a while (safe_mode_delay). ”h]”(hÔ)”}”(hŒarray_state”h]”hŒarray_state”…””}”(hjÕhjÓhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÓhŸh¶h M\hjÏubhä)”}”(hhh]”(hé)”}”(hŒôThis file contains a single word which describes the current state of the array. In many cases, the state can be set by writing the word for the desired state, however some states cannot be explicitly set, and some transitions are not allowed.”h]”hŒôThis file contains a single word which describes the current state of the array. In many cases, the state can be set by writing the word for the desired state, however some states cannot be explicitly set, and some transitions are not allowed.”…””}”(hjæhjähžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h M(hjáubhé)”}”(hŒÝSelect/poll works on this file. All changes except between Active_idle and active (which can be frequent and are not very interesting) are notified. active->active_idle is reported if the metadata is externally managed.”h]”hŒÝSelect/poll works on this file. All changes except between Active_idle and active (which can be frequent and are not very interesting) are notified. active->active_idle is reported if the metadata is externally managed.”…””}”(hjôhjòhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h M-hjáubhÉ)”}”(hhh]”(hÎ)”}”(hŒOclear No devices, no size, no level Writing is equivalent to STOP_ARRAY ioctl ”h]”(hÔ)”}”(hŒclear”h]”hŒclear”…””}”(hj hj hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÓhŸh¶h M5hj ubhä)”}”(hhh]”(hé)”}”(hŒNo devices, no size, no level”h]”hŒNo devices, no size, no level”…””}”(hj hj hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h M3hj ubhé)”}”(hŒ)Writing is equivalent to STOP_ARRAY ioctl”h]”hŒ)Writing is equivalent to STOP_ARRAY ioctl”…””}”(hj( hj& hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h M5hj ubeh}”(h]”h ]”h"]”h$]”h&]”uh1hãhj ubeh}”(h]”h ]”h"]”h$]”h&]”uh1hÍhŸh¶h M5hj ubhÎ)”}”(hŒ‹inactive May have some settings, but array is not active all IO results in error When written, doesn't tear down array, but just stops it ”h]”(hÔ)”}”(hŒinactive”h]”hŒinactive”…””}”(hjF hjD hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÓhŸh¶h M;hj@ ubhä)”}”(hhh]”(hé)”}”(hŒGMay have some settings, but array is not active all IO results in error”h]”hŒGMay have some settings, but array is not active all IO results in error”…””}”(hjW hjU hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h M8hjR ubhé)”}”(hŒ8When written, doesn't tear down array, but just stops it”h]”hŒ:When written, doesnâ€™t tear down array, but just stops it”…””}”(hje hjc hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h M;hjR ubeh}”(h]”h ]”h"]”h$]”h&]”uh1hãhj@ ubeh}”(h]”h ]”h"]”h$]”h&]”uh1hÍhŸh¶h M;hj ubhÎ)”}”(hŒ™suspended (not supported yet) All IO requests will block. The array can be reconfigured. Writing this, if accepted, will block until array is quiescent ”h]”(hÔ)”}”(hŒsuspended (not supported yet)”h]”hŒsuspended (not supported yet)”…””}”(hjƒ hj hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÓhŸh¶h M@hj} ubhä)”}”(hhh]”(hé)”}”(hŒ:All IO requests will block. The array can be reconfigured.”h]”hŒ:All IO requests will block. The array can be reconfigured.”…””}”(hj” hj’ hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h M>hj ubhé)”}”(hŒ>Writing this, if accepted, will block until array is quiescent”h]”hŒ>Writing this, if accepted, will block until array is quiescent”…””}”(hj¢ hj hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h M@hj ubeh}”(h]”h ]”h"]”h$]”h&]”uh1hãhj} ubeh}”(h]”h ]”h"]”h$]”h&]”uh1hÍhŸh¶h M@hj ubhÎ)”}”(hŒQreadonly no resync can happen. no superblocks get written. Write requests fail ”h]”(hÔ)”}”(hŒreadonly”h]”hŒreadonly”…””}”(hjÀ hj¾ hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÓhŸh¶h MEhjº ubhä)”}”(hhh]”(hé)”}”(hŒ2no resync can happen. no superblocks get written.”h]”hŒ2no resync can happen. no superblocks get written.”…””}”(hjÑ hjÏ hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h MChjÌ ubhé)”}”(hŒWrite requests fail”h]”hŒWrite requests fail”…””}”(hjß hjÝ hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h MEhjÌ ubeh}”(h]”h ]”h"]”h$]”h&]”uh1hãhjº ubeh}”(h]”h ]”h"]”h$]”h&]”uh1hÍhŸh¶h MEhj ubhÎ)”}”(hŒHread-auto like readonly, but behaves like ``clean`` on a write request. ”h]”(hÔ)”}”(hŒ read-auto”h]”hŒ read-auto”…””}”(hjý hjû hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÓhŸh¶h MHhj÷ ubhä)”}”(hhh]”hé)”}”(hŒ=like readonly, but behaves like ``clean`` on a write request.”h]”(hŒ like readonly, but behaves like ”…””}”(hŒ like readonly, but behaves like ”hjhžhhŸNh Nubj‡)”}”(hŒ ``clean``”h]”hŒclean”…””}”(hhhjhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j†hjubhŒ on a write request.”…””}”(hŒ on a write request.”hjhžhhŸNh Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h MHhj ubah}”(h]”h ]”h"]”h$]”h&]”uh1hãhj÷ ubeh}”(h]”h ]”h"]”h$]”h&]”uh1hÍhŸh¶h MHhj ubhÎ)”}”(hX9clean no pending writes, but otherwise active. When written to inactive array, starts without resync If a write request arrives then if metadata is known, mark ``dirty`` and switch to ``active``. if not known, block and switch to write-pending If written to an active array that has pending writes, then fails.”h]”(hÔ)”}”(hŒclean”h]”hŒclean”…””}”(hj@hj>hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÓhŸh¶h MRhj:ubhä)”}”(hhh]”(hé)”}”(hŒ(no pending writes, but otherwise active.”h]”hŒ(no pending writes, but otherwise active.”…””}”(hjQhjOhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h MKhjLubhé)”}”(hŒ5When written to inactive array, starts without resync”h]”hŒ5When written to inactive array, starts without resync”…””}”(hj_hj]hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h MMhjLubhé)”}”(hŒŽIf a write request arrives then if metadata is known, mark ``dirty`` and switch to ``active``. if not known, block and switch to write-pending”h]”(hŒ;If a write request arrives then if metadata is known, mark ”…””}”(hŒ;If a write request arrives then if metadata is known, mark ”hjkhžhhŸNh Nubj‡)”}”(hŒ ``dirty``”h]”hŒdirty”…””}”(hhhjthžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j†hjkubhŒ and switch to ”…””}”(hŒ and switch to ”hjkhžhhŸNh Nubj‡)”}”(hŒ ``active``”h]”hŒactive”…””}”(hhhj‡hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j†hjkubhŒ1. if not known, block and switch to write-pending”…””}”(hŒ1. if not known, block and switch to write-pending”hjkhžhhŸNh Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h MOhjLubhé)”}”(hŒBIf written to an active array that has pending writes, then fails.”h]”hŒBIf written to an active array that has pending writes, then fails.”…””}”(hj¢hj hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h MShjLubeh}”(h]”h ]”h"]”h$]”h&]”uh1hãhj:ubeh}”(h]”h ]”h"]”h$]”h&]”uh1hÍhŸh¶h MRhj ubhÎ)”}”(hŒhactive fully active: IO and resync can be happening. When written to inactive array, starts with resync ”h]”(hÔ)”}”(hŒactive”h]”hŒactive”…””}”(hjÀhj¾hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÓhŸh¶h MVhjºubhä)”}”(hhh]”hé)”}”(hŒ`fully active: IO and resync can be happening. When written to inactive array, starts with resync”h]”hŒ`fully active: IO and resync can be happening. When written to inactive array, starts with resync”…””}”(hjÑhjÏhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h MUhjÌubah}”(h]”h ]”h"]”h$]”h&]”uh1hãhjºubeh}”(h]”h ]”h"]”h$]”h&]”uh1hÍhŸh¶h MVhj ubhÎ)”}”(hŒRwrite-pending clean, but writes are blocked waiting for ``active`` to be written. ”h]”(hÔ)”}”(hŒ write-pending”h]”hŒ write-pending”…””}”(hjïhjíhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÓhŸh¶h MYhjéubhä)”}”(hhh]”hé)”}”(hŒCclean, but writes are blocked waiting for ``active`` to be written.”h]”(hŒ*clean, but writes are blocked waiting for ”…””}”(hŒ*clean, but writes are blocked waiting for ”hjþhžhhŸNh Nubj‡)”}”(hŒ ``active``”h]”hŒactive”…””}”(hhhjhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j†hjþubhŒ to be written.”…””}”(hŒ to be written.”hjþhžhhŸNh Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h MYhjûubah}”(h]”h ]”h"]”h$]”h&]”uh1hãhjéubeh}”(h]”h ]”h"]”h$]”h&]”uh1hÍhŸh¶h MYhj ubhÎ)”}”(hŒUactive-idle like active, but no writes have been seen for a while (safe_mode_delay). ”h]”(hÔ)”}”(hŒactive-idle”h]”hŒactive-idle”…””}”(hj2hj0hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÓhŸh¶h M\hj,ubhä)”}”(hhh]”hé)”}”(hŒHlike active, but no writes have been seen for a while (safe_mode_delay).”h]”hŒHlike active, but no writes have been seen for a while (safe_mode_delay).”…””}”(hjChjAhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h M\hj>ubah}”(h]”h ]”h"]”h$]”h&]”uh1hãhj,ubeh}”(h]”h ]”h"]”h$]”h&]”uh1hÍhŸh¶h M\hj ubeh}”(h]”h ]”h"]”h$]”h&]”uh1hÈhjáubeh}”(h]”h ]”h"]”h$]”h&]”uh1hãhjÏubeh}”(h]”h ]”h"]”h$]”h&]”uh1hÍhŸh¶h M\hjòubhÎ)”}”(hXƒbitmap/location This indicates where the write-intent bitmap for the array is stored. It can be one of ``none``, ``file`` or ``[+-]N``. ``file`` may later be extended to ``file:/file/name`` ``[+-]N`` means that many sectors from the start of the metadata. This is replicated on all devices. For arrays with externally managed metadata, the offset is from the beginning of the device. ”h]”(hÔ)”}”(hŒbitmap/location”•h]”hŒbitmap/location”…””}”(hjshjqhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÓhŸh¶h Mhhjmubhä)”}”(hhh]”(hé)”}”(hŒEThis indicates where the write-intent bitmap for the array is stored.”h]”hŒEThis indicates where the write-intent bitmap for the array is stored.”…””}”(hj„hj‚hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h M_hjubhé)”}”(hŒ©It can be one of ``none``, ``file`` or ``[+-]N``. ``file`` may later be extended to ``file:/file/name`` ``[+-]N`` means that many sectors from the start of the metadata.”h]”(hŒIt can be one of ”…””}”(hŒIt can be one of ”hjhžhhŸNh Nubj‡)”}”(hŒ``none``”h]”hŒnone”…””}”(hhhj™hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j†hjubhŒ, ”…””}”(hŒ, ”hjhžhhŸNh Nubj‡)”}”(hŒ``file``”h]”hŒfile”…””}”(hhhj¬hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j†hjubhŒ or ”…””}”(hŒ or ”hjhžhhŸNh Nubj‡)”}”(hŒ ``[+-]N``”h]”hŒ[+-]N”…””}”(hhhj¿hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j†hjubhŒ. ”…””}”(hŒ. ”hjhžhhŸNh Nubj‡)”}”(hŒ``file``”h]”hŒfile”…””}”(hhhjÒhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j†hjubhŒ may later be extended to ”…””}”(hŒ may later be extended to ”hjhžhhŸNh Nubj‡)”}”(hŒ``file:/file/name``”h]”hŒfile:/file/name”…””}”(hhhjåhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j†hjubhŒ ”…””}”(hŒ ”hjhžhhŸNh Nubj‡)”}”(hŒ ``[+-]N``”h]”hŒ[+-]N”…””}”(hhhjøhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j†hjubhŒ8 means that many sectors from the start of the metadata.”…””}”(hŒ8 means that many sectors from the start of the metadata.”hjhžhhŸNh Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h Mbhjubhé)”}”(hŒ€This is replicated on all devices. For arrays with externally managed metadata, the offset is from the beginning of the device.”h]”hŒ€This is replicated on all devices. For arrays with externally managed metadata, the offset is from the beginning of the device.”…””}”(hjhjhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h Mfhjubeh}”(h]”h ]”h"]”h$]”h&]”uh1hãhjmubeh}”(h]”h ]”h"]”h$]”h&]”uh1hÍhŸh¶h MhhjòubhÎ)”}”(hŒôbitmap/chunksize The size, in bytes, of the chunk which will be represented by a single bit. For RAID456, it is a portion of an individual device. For RAID10, it is a portion of the array. For RAID1, it is both (they come to the same thing). ”h]”(hÔ)”}”(hŒbitmap/chunksize”h]”hŒbitmap/chunksize”…””}”(hj1hj/hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÓhŸh¶h Mnhj+ubhä)”}”(hhh]”hé)”}”(hŒâThe size, in bytes, of the chunk which will be represented by a single bit. For RAID456, it is a portion of an individual device. For RAID10, it is a portion of the array. For RAID1, it is both (they come to the same thing).”h]”hŒâThe size, in bytes, of the chunk which will be represented by a single bit. For RAID456, it is a portion of an individual device. For RAID10, it is a portion of the array. For RAID1, it is both (they come to the same thing).”…””}”(hjBhj@hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h Mkhj=ubah}”(h]”h ]”h"]”h$]”h&]”uh1hãhj+ubeh}”(h]”h ]”h"]”h$]”h&]”uh1hÍhŸh¶h MnhjòubhÎ)”}”(hŒìbitmap/time_base The time, in seconds, between looking for bits in the bitmap to be cleared. In the current implementation, a bit will be cleared between 2 and 3 times ``time_base`` after all the covered blocks are known to be in-sync. ”h]”(hÔ)”}”(hŒbitmap/time_base”h]”hŒbitmap/time_base”…””}”(hj`hj^hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÓhŸh¶h MthjZubhä)”}”(hhh]”hé)”}”(hŒÚThe time, in seconds, between looking for bits in the bitmap to be cleared. In the current implementation, a bit will be cleared between 2 and 3 times ``time_base`` after all the covered blocks are known to be in-sync.”h]”(hŒ—The time, in seconds, between looking for bits in the bitmap to be cleared. In the current implementation, a bit will be cleared between 2 and 3 times ”…””}”(hŒ—The time, in seconds, between looking for bits in the bitmap to be cleared. In the current implementation, a bit will be cleared between 2 and 3 times ”hjohžhhŸNh Nubj‡)”}”(hŒ ``time_base``”h]”hŒ time_base”…””}”(hhhjxhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j†hjoubhŒ6 after all the covered blocks are known to be in-sync.”…””}”(hŒ6 after all the covered blocks are known to be in-sync.”hjohžhhŸNh Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h Mqhjlubah}”(h]”h ]”h"]”h$]”h&]”uh1hãhjZubeh}”(h]”h ]”h"]”h$]”h&]”uh1hÍhŸh¶h MthjòubhÎ)”}”(hXObitmap/backlog When write-mostly devices are active in a RAID1, write requests to those devices proceed in the background - the filesystem (or other user of the device) does not have to wait for them. ``backlog`` sets a limit on the number of concurrent background writes. If there are more than this, new writes will by synchronous. ”h]”(hÔ)”}”(hŒbitmap/backlog”h]”hŒbitmap/backlog”…””}”(hj£hj¡hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÓhŸh¶h M|hjubhä)”}”(hhh]”hé)”}”(hX?When write-mostly devices are active in a RAID1, write requests to those devices proceed in the background - the filesystem (or other user of the device) does not have to wait for them. ``backlog`` sets a limit on the number of concurrent background writes. If there are more than this, new writes will by synchronous.”h]”(hŒºWhen write-mostly devices are active in a RAID1, write requests to those devices proceed in the background - the filesystem (or other user of the device) does not have to wait for them. ”…””}”(hŒºWhen write-mostly devices are active in a RAID1, write requests to those devices proceed in the background - the filesystem (or other user of the device) does not have to wait for them. ”hj²hžhhŸNh Nubj‡)”}”(hŒ``backlog``”h]”hŒbacklog”…””}”(hhhj»hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j†hj²ubhŒz sets a limit on the number of concurrent background writes. If there are more than this, new writes will by synchronous.”…””}”(hŒz sets a limit on the number of concurrent background writes. If there are more than this, new writes will by synchronous.”hj²hžhhŸNh Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h Mwhj¯ubah}”(h]”h ]”h"]”h$]”h&]”uh1hãhjubeh}”(h]”h ]”h"]”h$]”h&]”uh1hÍhŸh¶h M|hjòubhÎ)”}”(hXUbitmap/metadata This can be either ``internal`` or ``external``. ``internal`` is the default and means the metadata for the bitmap is stored in the first 256 bytes of the allocated space and is managed by the md module. ``external`` means that bitmap metadata is managed externally to the kernel (i.e. by some userspace program) ”h]”(hÔ)”}”(hŒbitmap/metadata”h]”hŒbitmap/metadata”…””}”(hjæhjähžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÓhŸh¶h Mˆhjàubhä)”}”(hhh]”(hé)”}”(hŒ0This can be either ``internal`` or ``external``.”h]”(hŒThis can be either ”…””}”(hŒThis can be either ”hjõhžhhŸNh Nubj‡)”}”(hŒ``internal``”h]”hŒinternal”…””}”(hhhjþhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j†hjõubhŒ or ”…””}”(hŒ or ”hjõhžhhŸNh Nubj‡)”}”(hŒ``external``”h]”hŒexternal”…””}”(hhhjhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j†hjõubhŒ.”…””}”(hj>hjõhžhhŸNh Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h MhjòubhÉ)”}”(hhh]”(hÎ)”}”(hŒ›``internal`` is the default and means the metadata for the bitmap is stored in the first 256 bytes of the allocated space and is managed by the md module. ”h]”(hÔ)”}”(hŒ``internal``”h]”j‡)”}”(hj2h]”hŒinternal”…””}”(hhhj4hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j†hj0ubah}”(h]”h ]”h"]”h$]”h&]”uh1hÓhŸh¶h M„hj,ubhä)”}”(hhh]”hé)”}”(hŒis the default and means the metadata for the bitmap is stored in the first 256 bytes of the allocated space and is managed by the md module.”h]”hŒis the default and means the metadata for the bitmap is stored in the first 256 bytes of the allocated space and is managed by the md module.”…””}”(hjLhjJhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h M‚hjGubah}”(h]”h ]”h"]”h$]”h&]”uh1hãhj,ubeh}”(h]”h ]”h"]”h$]”h&]”uh1hÍhŸh¶h M„hj)ubhÎ)”}”(hŒm``external`` means that bitmap metadata is managed externally to the kernel (i.e. by some userspace program) ”h]”(hÔ)”}”(hŒ``external``”h]”j‡)”}”(hjjh]”hŒexternal”…””}”(hhhjlhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j†hjhubah}”(h]”h ]”h"]”h$]”h&]”uh1hÓhŸh¶h Mˆhjdubhä)”}”(hhh]”hé)”}”(hŒ_means that bitmap metadata is managed externally to the kernel (i.e. by some userspace program)”h]”hŒ_means that bitmap metadata is managed externally to the kernel (i.e. by some userspace program)”…””}”(hj„hj‚hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h M‡hjubah}”(h]”h ]”h"]”h$]”h&]”uh1hãhjdubeh}”(h]”h ]”h"]”h$]”h&]”uh1hÍhŸh¶h Mˆhj)ubeh}”(h]”h ]”h"]”h$]”h&]”uh1hÈhjòubeh}”(h]”h ]”h"]”h$]”h&]”uh1hãhjàubeh}”(h]”h ]”h"]”h$]”h&]”uh1hÍhŸh¶h MˆhjòubhÎ)”}”(hXåbitmap/can_clear This is either ``true`` or ``false``. If ``true``, then bits in the bitmap will be cleared when the corresponding blocks are thought to be in-sync. If ``false``, bits will never be cleared. This is automatically set to ``false`` if a write happens on a degraded array, or if the array becomes degraded during a write. When metadata is managed externally, it should be set to true once the array becomes non-degraded, and this fact has been recorded in the metadata. ”h]”(hÔ)”}”(hŒbitmap/can_clear”h]”hŒbitmap/can_clear”…””}”(hj´hj²hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÓhŸh¶h M’hj®ubhä)”}”(hhh]”hé)”}”(hXÓThis is either ``true`` or ``false``. If ``true``, then bits in the bitmap will be cleared when the corresponding blocks are thought to be in-sync. If ``false``, bits will never be cleared. This is automatically set to ``false`` if a write happens on a degraded array, or if the array becomes degraded during a write. When metadata is managed externally, it should be set to true once the array becomes non-degraded, and this fact has been recorded in the metadata.”h]”(hŒThis is either ”…””}”(hŒThis is either ”hjÃhžhhŸNh Nubj‡)”}”(hŒ``true``”h]”hŒtrue”…””}”(hhhjÌhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j†hjÃubhŒ or ”…””}”(hŒ or ”hjÃhžhhŸNh Nubj‡)”}”(hŒ ``false``”h]”hŒfalse”…””}”(hhhjßhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j†hjÃubhŒ. If ”…””}”(hŒ. If ”hjÃhžhhŸNh Nubj‡)”}”(hŒ``true``”h]”hŒtrue”…””}”(hhhjòhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j†hjÃubhŒg, then bits in the bitmap will be cleared when the corresponding blocks are thought to be in-sync. If ”…””}”(hŒg, then bits in the bitmap will be cleared when the corresponding blocks are thought to be in-sync. If ”hjÃhžhhŸNh Nubj‡)”}”(hŒ ``false``”h]”hŒfalse”…””}”(hhhjhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j†hjÃubhŒ;, bits will never be cleared. This is automatically set to ”…””}”(hŒ;, bits will never be cleared. This is automatically set to ”hjÃhžhhŸNh Nubj‡)”}”(hŒ ``false``”h]”hŒfalse”…””}”(hhhjhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j†hjÃubhŒí if a write happens on a degraded array, or if the array becomes degraded during a write. When metadata is managed externally, it should be set to true once the array becomes non-degraded, and this fact has been recorded in the metadata.”…””}”(hŒí if a write happens on a degraded array, or if the array becomes degraded during a write. When metadata is managed externally, it should be set to true once the array becomes non-degraded, and this fact has been recorded in the metadata.”hjÃhžhhŸNh Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h M‹hjÀubah}”(h]”h ]”h"]”h$]”h&]”uh1hãhj®ubeh}”(h]”h ]”h"]”h$]”h&]”uh1hÍhŸh¶h M’hjòubhÎ)”}”(hX–consistency_policy This indicates how the array maintains consistency in case of unexpected shutdown. It can be: none Array has no redundancy information, e.g. raid0, linear. resync Full resync is performed and all redundancy is regenerated when the array is started after unclean shutdown. bitmap Resync assisted by a write-intent bitmap. journal For raid4/5/6, journal device is used to log transactions and replay after unclean shutdown. ppl For raid5 only, Partial Parity Log is used to close the write hole and eliminate resync. The accepted values when writing to this file are ``ppl`` and ``resync``, used to enable and disable PPL. ”h]”(hÔ)”}”(hŒconsistency_policy”h]”hŒconsistency_policy”…””}”(hjChjAhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÓhŸh¶h M«hj=ubhä)”}”(hhh]”(hé)”}”(hŒ]This indicates how the array maintains consistency in case of unexpected shutdown. It can be:”h]”hŒ]This indicates how the array maintains consistency in case of unexpected shutdown. It can be:”…””}”(hjThjRhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h M•hjOubhÉ)”}”(hhh]”(hÎ)”}”(hŒ>none Array has no redundancy information, e.g. raid0, linear. ”h]”(hÔ)”}”(hŒnone”h]”hŒnone”…””}”(hjihjghžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÓhŸh¶h M™hjcubhä)”}”(hhh]”hé)”}”(hŒ8Array has no redundancy information, e.g. raid0, linear.”h]”hŒ8Array has no redundancy information, e.g. raid0, linear.”…””}”(hjzhjxhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h M™hjuubah}”(h]”h ]”h"]”h$]”h&]”uh1hãhjcubeh}”(h]”h ]”h"]”h$]”h&]”uh1hÍhŸh¶h M™hj`ubhÎ)”}”(hŒtresync Full resync is performed and all redundancy is regenerated when the array is started after unclean shutdown. ”h]”(hÔ)”}”(hŒresync”h]”hŒresync”…””}”(hj˜hj–hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÓhŸh¶h Mhj’ubhä)”}”(hhh]”hé)”}”(hŒlFull resync is performed and all redundancy is regenerated when the array is started after unclean shutdown.”h]”hŒlFull resync is performed and all redundancy is regenerated when the array is started after unclean shutdown.”…””}”(hj©hj§hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h Mœhj¤ubah}”(h]”h ]”h"]”h$]”h&]”uh1hãhj’ubeh}”(h]”h ]”h"]”h$]”h&]”uh1hÍhŸh¶h Mhj`ubhÎ)”}”(hŒ1bitmap Resync assisted by a write-intent bitmap. ”h]”(hÔ)”}”(hŒbitmap”h]”hŒbitmap”…””}”(hjÇhjÅhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÓhŸh¶h M hjÁubhä)”}”(hhh]”hé)”}”(hŒ)Resync assisted by a write-intent bitmap.”h]”hŒ)Resync assisted by a write-intent bitmap.”…””}”(hjØhjÖhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h M hjÓubah}”(h]”h ]”h"]”h$]”h&]”uh1hãhjÁubeh}”(h]”h ]”h"]”h$]”h&]”uh1hÍhŸh¶h M hj`ubhÎ)”}”(hŒejournal For raid4/5/6, journal device is used to log transactions and replay after unclean shutdown. ”h]”(hÔ)”}”(hŒjournal”h]”hŒjournal”…””}”(hjöhjôhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÓhŸh¶h M¤hjðubhä)”}”(hhh]”hé)”}”(hŒ\For raid4/5/6, journal device is used to log transactions and replay after unclean shutdown.”h]”hŒ\For raid4/5/6, journal device is used to log transactions and replay after unclean shutdown.”…””}”(hjhjhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h M£hjubah}”(h]”h ]”h"]”h$]”h&]”uh1hãhjðubeh}”(h]”h ]”h"]”h$]”h&]”uh1hÍhŸh¶h M¤hj`ubhÎ)”}”(hŒ]ppl For raid5 only, Partial Parity Log is used to close the write hole and eliminate resync. ”h]”(hÔ)”}”(hŒppl”h]”hŒppl”…””}”(hj%hj#hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÓhŸh¶h M¨hjubhä)”}”(hhh]”hé)”}”(hŒXFor raid5 only, Partial Parity Log is used to close the write hole and eliminate resync.”h]”hŒXFor raid5 only, Partial Parity Log is used to close the write hole and eliminate resync.”…””}”(hj6hj4hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h M§hj1ubah}”(h]”h ]”h"]”h$]”h&]”uh1hãhjubeh}”(h]”h ]”h"]”h$]”h&]”uh1hÍhŸh¶h M¨hj`ubeh}”(h]”h ]”h"]”h$]”h&]”uh1hÈhjOubhé)”}”(hŒiThe accepted values when writing to this file are ``ppl`` and ``resync``, used to enable and disable PPL.”h]”(hŒ2The accepted values when writing to this file are ”…””}”(hŒ2The accepted values when writing to this file are ”hjThžhhŸNh Nubj‡)”}”(hŒ``ppl``”h]”hŒppl”…””}”(hhhj]hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j†hjTubhŒ and ”…””}”(hŒ and ”hjThžhhŸNh Nubj‡)”}”(hŒ ``resync``”h]”hŒresync”…””}”(hhhjphžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j†hjTubhŒ!, used to enable and disable PPL.”…””}”(hŒ!, used to enable and disable PPL.”hjThžhhŸNh Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h MªhjOubeh}”(h]”h ]”h"]”h$]”h&]”uh1hãhj=ubeh}”(h]”h ]”h"]”h$]”h&]”uh1hÍhŸh¶h M«hjòubhÎ)”}”(hŒiuuid This indicates the UUID of the array in the following format: xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx ”h]”(hÔ)”}”(hŒuuid”h]”hŒuuid”…””}”(hj›hj™hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÓhŸh¶h M°hj•ubhä)”}”(hhh]”hé)”}”(hŒbThis indicates the UUID of the array in the following format: xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx”h]”hŒbThis indicates the UUID of the array in the following format: xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx”…””}”(hj¬hjªhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h M®hj§ubah}”(h]”h ]”h"]”h$]”h&]”uh1hãhj•ubeh}”(h]”h ]”h"]”h$]”h&]”uh1hÍhŸh¶h M°hjòubeh}”(h]”h ]”h"]”h$]”h&]”uh1hÈhjïubah}”(h]”h ]”h"]”h$]”h&]”uh1jíhjihžhhŸNh Nubhé)”}”(hŒmAs component devices are added to an md array, they appear in the ``md`` directory as new directories named::”h]”(hŒBAs component devices are added to an md array, they appear in the ”…””}”(hŒBAs component devices are added to an md array, they appear in the ”hjÐhžhhŸNh Nubj‡)”}”(hŒ``md``”h]”hŒmd”…””}”(hhhjÙhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j†hjÐubhŒ$ directory as new directories named:”…””}”(hŒ$ directory as new directories named:”hjÐhžhhŸNh Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h M²hjihžhubj4)”}”(hŒdev-XXX”h]”hŒdev-XXX”…””}”(hhhjòubah}”(h]”h ]”h"]”h$]”h&]”jCjDuh1j3hŸh¶h Mµhjihžhubhé)”}”(hŒawhere ``XXX`` is a name that the kernel knows for the device, e.g. hdb1. Each directory contains:”h]”(hŒwhere ”…””}”(hŒwhere ”hjhžhhŸNh Nubj‡)”}”(hŒ``XXX``”h]”hŒXXX”…””}”(hhhj hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j†hjubhŒT is a name that the kernel knows for the device, e.g. hdb1. Each directory contains:”…””}”(hŒT is a name that the kernel knows for the device, e.g. hdb1. Each directory contains:”hjhžhhŸNh Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h M·hjihžhubjî)”}”(hhh]”hÉ)”}”(hhh]”(hÎ)”}”(hŒblock a symlink to the block device in /sys/block, e.g.:: /sys/block/md0/md/dev-hdb1/block -> ../../../../block/hdb/hdb1 ”h]”(hÔ)”}”(hŒblock”h]”hŒblock”…””}”(hj.hj,hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÓhŸh¶h M½hj(ubhä)”}”(hhh]”(hé)”}”(hŒ3a symlink to the block device in /sys/block, e.g.::”h]”hŒ2a symlink to the block device in /sys/block, e.g.:”…””}”(hŒ2a symlink to the block device in /sys/block, e.g.:”hj=hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h M»hj:ubj4)”}”(hŒ>/sys/block/md0/md/dev-hdb1/block -> ../../../../block/hdb/hdb1”h]”hŒ>/sys/block/md0/md/dev-hdb1/block -> ../../../../block/hdb/hdb1”…””}”(hhhjLubah}”(h]”h ]”h"]”h$]”h&]”jCjDuh1j3hŸh¶h M½hj:ubeh}”(h]”h ]”h"]”h$]”h&]”uh1hãhj(ubeh}”(h]”h ]”h"]”h$]”h&]”uh1hÍhŸh¶h M½hj%ubhÎ)”}”(hŒZsuper A file containing an image of the superblock read from, or written to, that device. ”h]”(hÔ)”}”(hŒsuper”h]”hŒsuper”…””}”(hjlhjjhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÓhŸh¶h MÁhjfubhä)”}”(hhh]”hé)”}”(hŒSA file containing an image of the superblock read from, or written to, that device.”h]”hŒSA file containing an image of the superblock read from, or written to, that device.”…””}”(hj}hj{hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h MÀhjxubah}”(h]”h ]”h"]”h$]”h&]”uh1hãhjfubeh}”(h]”h ]”h"]”h$]”h&]”uh1hÍhŸh¶h MÁhj%ubhÎ)”}”(hXústate A file recording the current state of the device in the array which can be a comma separated list of: faulty device has been kicked from active use due to a detected fault, or it has unacknowledged bad blocks in_sync device is a fully in-sync member of the array writemostly device will only be subject to read requests if there are no other options. This applies only to raid1 arrays. blocked device has failed, and the failure hasn't been acknowledged yet by the metadata handler. Writes that would write to this device if it were not faulty are blocked. spare device is working, but not a full member. This includes spares that are in the process of being recovered to write_error device has ever seen a write error. want_replacement device is (mostly) working but probably should be replaced, either due to errors or due to user request. replacement device is a replacement for another active device with same raid_disk. This list may grow in future. This can be written to. Writing ``faulty`` simulates a failure on the device. Writing ``remove`` removes the device from the array. Writing ``writemostly`` sets the writemostly flag. Writing ``-writemostly`` clears the writemostly flag. Writing ``blocked`` sets the ``blocked`` flag. Writing ``-blocked`` clears the ``blocked`` flags and allows writes to complete and possibly simulates an error. Writing ``in_sync`` sets the in_sync flag. Writing ``write_error`` sets writeerrorseen flag. Writing ``-write_error`` clears writeerrorseen flag. Writing ``want_replacement`` is allowed at any time except to a replacement device or a spare. It sets the flag. Writing ``-want_replacement`` is allowed at any time. It clears the flag. Writing ``replacement`` or ``-replacement`` is only allowed before starting the array. It sets or clears the flag. This file responds to select/poll. Any change to ``faulty`` or ``blocked`` causes an event. ”h]”(hÔ)”}”(hŒstate”h]”hŒstate”…””}”(hj›hj™hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÓhŸh¶h Mhj•ubhä)”}”(hhh]”(hé)”}”(hŒeA file recording the current state of the device in the array which can be a comma separated list of:”h]”hŒeA file recording the current state of the device in the array which can be a comma separated list of:”…””}”(hj¬hjªhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h MÄhj§ubjî)”}”(hhh]”hÉ)”}”(hhh]”(hÎ)”}”(hŒkfaulty device has been kicked from active use due to a detected fault, or it has unacknowledged bad blocks ”h]”(hÔ)”}”(hŒfaulty”h]”hŒfaulty”…””}”(hjÄhjÂhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÓhŸh¶h MÊhj¾ubhä)”}”(hhh]”hé)”}”(hŒcdevice has been kicked from active use due to a detected fault, or it has unacknowledged bad blocks”h]”hŒcdevice has been kicked from active use due to a detected fault, or it has unacknowledged bad blocks”…””}”(hjÕhjÓhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h MÈhjÐubah}”(h]”h ]”h"]”h$]”h&]”uh1hãhj¾ubeh}”(h]”h ]”h"]”h$]”h&]”uh1hÍhŸh¶h MÊhj»ubhÎ)”}”(hŒ6in_sync device is a fully in-sync member of the array ”h]”(hÔ)”}”(hŒin_sync”h]”hŒin_sync”…””}”(hjóhjñhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÓhŸh¶h MÍhjíubhä)”}”(hhh]”hé)”}”(hŒ-device is a fully in-sync member of the array”h]”hŒ-device is a fully in-sync member of the array”…””}”(hjhjhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h MÍhjÿubah}”(h]”h ]”h"]”h$]”h&]”uh1hãhjíubeh}”(h]”h ]”h"]”h$]”h&]”uh1hÍhŸh¶h MÍhj»ubhÎ)”}”(hŒ|writemostly device will only be subject to read requests if there are no other options. This applies only to raid1 arrays. ”h]”(hÔ)”}”(hŒwritemostly”h]”hŒwritemostly”…””}”(hj"hj hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÓhŸh¶h MÓhjubhä)”}”(hhh]”(hé)”}”(hŒKdevice will only be subject to read requests if there are no other options.”h]”hŒKdevice will only be subject to read requests if there are no other options.”…””}”(hj3hj1hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h MÐhj.ubhé)”}”(hŒ"This applies only to raid1 arrays.”h]”hŒ"This applies only to raid1 arrays.”…””}”(hjAhj?hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h MÓhj.ubeh}”(h]”h ]”h"]”h$]”h&]”uh1hãhjubeh}”(h]”h ]”h"]”h$]”h&]”uh1hÍhŸh¶h MÓhj»ubhÎ)”}”(hŒ¬blocked device has failed, and the failure hasn't been acknowledged yet by the metadata handler. Writes that would write to this device if it were not faulty are blocked. ”h]”(hÔ)”}”(hŒblocked”h]”hŒblocked”…””}”(hj_hj]hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÓhŸh¶h MÚhjYubhä)”}”(hhh]”(hé)”}”(hŒXdevice has failed, and the failure hasn't been acknowledged yet by the metadata handler.”h]”hŒZdevice has failed, and the failure hasnâ€™t been acknowledged yet by the metadata handler.”…””}”(hjphjnhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h MÖhjkubhé)”}”(hŒIWrites that would write to this device if it were not faulty are blocked.”h]”hŒIWrites that would write to this device if it were not faulty are blocked.”…””}”(hj~hj|hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h MÙhjkubeh}”(h]”h ]”h"]”h$]”h&]”uh1hãhjYubeh}”(h]”h ]”h"]”h$]”h&]”uh1hÍhŸh¶h MÚhj»ubhÎ)”}”(hŒtspare device is working, but not a full member. This includes spares that are in the process of being recovered to ”h]”(hÔ)”}”(hŒspare”h]”hŒspare”…””}”(hjœhjšhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÓhŸh¶h Màhj–ubhä)”}”(hhh]”(hé)”}”(hŒ)device is working, but not a full member.”h]”hŒ)device is working, but not a full member.”…””}”(hjhj«hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h MÝhj¨ubhé)”}”(hŒBThis includes spares that are in the process of being recovered to”h]”hŒBThis includes spares that are in the process of being recovered to”…””}”(hj»hj¹hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h Mßhj¨ubeh}”(h]”h ]”h"]”h$]”h&]”uh1hãhj–ubeh}”(h]”h ]”h"]”h$]”h&]”uh1hÍhŸh¶h Màhj»ubhÎ)”}”(hŒ0write_error device has ever seen a write error. ”h]”(hÔ)”}”(hŒwrite_error”h]”hŒwrite_error”…””}”(hjÙhj×hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÓhŸh¶h MãhjÓubhä)”}”(hhh]”hé)”}”(hŒ#device has ever seen a write error.”h]”hŒ#device has ever seen a write error.”…””}”(hjêhjèhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h Mãhjåubah}”(h]”h ]”h"]”h$]”h&]”uh1hãhjÓubeh}”(h]”h ]”h"]”h$]”h&]”uh1hÍhŸh¶h Mãhj»ubhÎ)”}”(hŒzwant_replacement device is (mostly) working but probably should be replaced, either due to errors or due to user request. ”h]”(hÔ)”}”(hŒwant_replacement”h]”hŒwant_replacement”…””}”(hjhjhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÓhŸh¶h Mèhjubhä)”}”(hhh]”hé)”}”(hŒhdevice is (mostly) working but probably should be replaced, either due to errors or due to user request.”h]”hŒhdevice is (mostly) working but probably should be replaced, either due to errors or due to user request.”…””}”(hjhjhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h Mæhjubah}”(h]”h ]”h"]”h$]”h&]”uh1hãhjubeh}”(h]”h ]”h"]”h$]”h&]”uh1hÍhŸh¶h Mèhj»ubhÎ)”}”(hŒTreplacement device is a replacement for another active device with same raid_disk. ”h]”(hÔ)”}”(hŒreplacement”h]”hŒreplacement”…””}”(hj7hj5hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÓhŸh¶h Míhj1ubhä)”}”(hhh]”hé)”}”(hŒFdevice is a replacement for another active device with same raid_disk.”h]”hŒFdevice is a replacement for another active device with same raid_disk.”…””}”(hjHhjFhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h MëhjCubah}”(h]”h ]”h"]”h$]”h&]”uh1hãhj1ubeh}”(h]”h ]”h"]”h$]”h&]”uh1hÍhŸh¶h Míhj»ubeh}”(h]”h ]”h"]”h$]”h&]”uh1hÈhj¸ubah}”(h]”h ]”h"]”h$]”h&]”uh1jíhj§ubhé)”}”(hŒThis list may grow in future.”h]”hŒThis list may grow in future.”…””}”(hjnhjlhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h Mïhj§ubhé)”}”(hŒThis can be written to.”h]”hŒThis can be written to.”…””}”(hj|hjzhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h Mñhj§ubhé)”}”(hŒ6Writing ``faulty`` simulates a failure on the device.”h]”(hŒWriting ”…””}”(hŒWriting ”hjˆhžhhŸNh Nubj‡)”}”(hŒ ``faulty``”h]”hŒfaulty”…””}”(hhhj‘hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j†hjˆubhŒ$ simulates a failure on the device.”…””}”(hŒ$ simulates a failure on the device.”hjˆhžhhŸNh Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h Móhj§ubhé)”}”(hŒ5Writing ``remove`` removes the device from the array.”h]”(hŒWriting ”…””}”(hŒWriting ”hjªhžhhŸNh Nubj‡)”}”(hŒ ``remove``”h]”hŒremove”…””}”(hhhj³hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j†hjªubhŒ# removes the device from the array.”…””}”(hŒ# removes the device from the array.”hjªhžhhŸNh Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h Mõhj§ubhé)”}”(hŒ2Writing ``writemostly`` sets the writemostly flag.”h]”(hŒWriting ”…””}”(hŒWriting ”hjÌhžhhŸNh Nubj‡)”}”(hŒ``writemostly``”h]”hŒwritemostly”…””}”(hhhjÕhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j†hjÌubhŒ sets the writemostly flag.”…””}”(hŒ sets the writemostly flag.”hjÌhžhhŸNh Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h M÷hj§ubhé)”}”(hŒ5Writing ``-writemostly`` clears the writemostly flag.”h]”(hŒWriting ”…””}”(hŒWriting ”hjîhžhhŸNh Nubj‡)”}”(hŒ``-writemostly``”h]”hŒ-writemostly”…””}”(hhhj÷hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j†hjîubhŒ clears the writemostly flag.”…””}”(hŒ clears the writemostly flag.”hjîhžhhŸNh Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h Mùhj§ubhé)”}”(hŒ.Writing ``blocked`` sets the ``blocked`` flag.”h]”(hŒWriting ”…””}”(hŒWriting ”hjhžhhŸNh Nubj‡)”}”(hŒ``blocked``”h]”hŒblocked”…””}”(hhhjhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j†hjubhŒ sets the ”…””}”(hŒ sets the ”hjhžhhŸNh Nubj‡)”}”(hŒ``blocked``”h]”hŒblocked”…””}”(hhhj,hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j†hjubhŒ flag.”…””}”(hŒ flag.”hjhžhhŸNh Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h Mûhj§ubhé)”}”(hŒpWriting ``-blocked`` clears the ``blocked`` flags and allows writes to complete and possibly simulates an error.”h]”(hŒWriting ”…””}”(hŒWriting ”hjEhžhhŸNh Nubj‡)”}”(hŒ``-blocked``”h]”hŒ-blocked”…””}”(hhhjNhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j†hjEubhŒ clears the ”…””}”(hŒ clears the ”hjEhžhhŸNh Nubj‡)”}”(hŒ``blocked``”h]”hŒblocked”…””}”(hhhjahžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j†hjEubhŒE flags and allows writes to complete and possibly simulates an error.”…””}”(hŒE flags and allows writes to complete and possibly simulates an error.”hjEhžhhŸNh Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h Mýhj§ubhé)”}”(hŒ*Writing ``in_sync`` sets the in_sync flag.”h]”(hŒWriting ”…””}”(hŒWriting ”hjzhžhhŸNh Nubj‡)”}”(hŒ``in_sync``”h]”hŒin_sync”…””}”(hhhjƒhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j†hjzubhŒ sets the in_sync flag.”…””}”(hŒ sets the in_sync flag.”hjzhžhhŸNh Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h Mhj§ubhé)”}”(hŒ1Writing ``write_error`` sets writeerrorseen flag.”h]”(hŒWriting ”…””}”(hŒWriting ”hjœhžhhŸNh Nubj‡)”}”(hŒ``write_error``”h]”hŒwrite_error”…””}”(hhhj¥hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j†hjœubhŒ sets writeerrorseen flag.”…””}”(hŒ sets writeerrorseen flag.”hjœhžhhŸNh Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h Mhj§ubhé)”}”(hŒ4Writing ``-write_error`` clears writeerrorseen flag.”h]”(hŒWriting ”…””}”(hŒWriting ”hj¾hžhhŸNh Nubj‡)”}”(hŒ``-write_error``”h]”hŒ-write_error”…””}”(hhhjÇhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j†hj¾ubhŒ clears writeerrorseen flag.”…””}”(hŒ clears writeerrorseen flag.”hj¾hžhhŸNh Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h Mhj§ubhé)”}”(hŒqWriting ``want_replacement`` is allowed at any time except to a replacement device or a spare. It sets the flag.”h]”(hŒWriting ”…””}”(hŒWriting ”hjàhžhhŸNh Nubj‡)”}”(hŒ``want_replacement``”h]”hŒwant_replacement”…””}”(hhhjéhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j†hjàubhŒU is allowed at any time except to a replacement device or a spare. It sets the flag.”…””}”(hŒU is allowed at any time except to a replacement device or a spare. It sets the flag.”hjàhžhhŸNh Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h Mhj§ubhé)”}”(hŒJWriting ``-want_replacement`` is allowed at any time. It clears the flag.”h]”(hŒWriting ”…””}”(hŒWriting ”hjhžhhŸNh Nubj‡)”}”(hŒ``-want_replacement``”h]”hŒ-want_replacement”…””}”(hhhjhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j†hjubhŒ- is allowed at any time. It clears the flag.”…””}”(hŒ- is allowed at any time. It clears the flag.”hjhžhhŸNh Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h M hj§ubhé)”}”(hŒsWriting ``replacement`` or ``-replacement`` is only allowed before starting the array. It sets or clears the flag.”h]”(hŒWriting ”…””}”(hŒWriting ”hj$hžhhŸNh Nubj‡)”}”(hŒ``replacement``”h]”hŒreplacement”…””}”(hhhj-hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j†hj$ubhŒ or ”…””}”(hŒ or ”hj$hžhhŸNh Nubj‡)”}”(hŒ``-replacement``”h]”hŒ-replacement”…””}”(hhhj@hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j†hj$ubhŒH is only allowed before starting the array. It sets or clears the flag.”…””}”(hŒH is only allowed before starting the array. It sets or clears the flag.”hj$hžhhŸNh Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h Mhj§ubhé)”}”(hŒ[This file responds to select/poll. Any change to ``faulty`` or ``blocked`` causes an event.”h]”(hŒ1This file responds to select/poll. Any change to ”…””}”(hŒ1This file responds to select/poll. Any change to ”hjYhžhhŸNh Nubj‡)”}”(hŒ ``faulty``”h]”hŒfaulty”…””}”(hhhjbhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j†hjYubhŒ or ”…””}”(hŒ or ”hjYhžhhŸNh Nubj‡)”}”(hŒ``blocked``”h]”hŒblocked”…””}”(hhhjuhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j†hjYubhŒ causes an event.”…””}”(hŒ causes an event.”hjYhžhhŸNh Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h Mhj§ubeh}”(h]”h ]”h"]”h$]”h&]”uh1hãhj•ubeh}”(h]”h ]”h"]”h$]”h&]”uh1hÍhŸh¶h Mhj%ubhÎ)”}”(hXÁerrors An approximate count of read errors that have been detected on this device but have not caused the device to be evicted from the array (either because they were corrected or because they happened while the array was read-only). When using version-1 metadata, this value persists across restarts of the array. This value can be written while assembling an array thus providing an ongoing count for arrays with metadata managed by userspace. ”h]”(hÔ)”}”(hŒerrors”h]”hŒerrors”…””}”(hj hjžhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÓhŸh¶h Mhjšubhä)”}”(hhh]”(hé)”}”(hX5An approximate count of read errors that have been detected on this device but have not caused the device to be evicted from the array (either because they were corrected or because they happened while the array was read-only). When using version-1 metadata, this value persists across restarts of the array.”h]”hX5An approximate count of read errors that have been detected on this device but have not caused the device to be evicted from the array (either because they were corrected or because they happened while the array was read-only). When using version-1 metadata, this value persists across restarts of the array.”…””}”(hj±hj¯hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h Mhj¬ubhé)”}”(hŒ‚This value can be written while assembling an array thus providing an ongoing count for arrays with metadata managed by userspace.”h]”hŒ‚This value can be written while assembling an array thus providing an ongoing count for arrays with metadata managed by userspace.”…””}”(hj¿hj½hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h Mhj¬ubeh}”(h]”h ]”h"]”h$]”h&]”uh1hãhjšubeh}”(h]”h ]”h"]”h$]”h&]”uh1hÍhŸh¶h Mhj%ubhÎ)”}”(hXyslot This gives the role that the device has in the array. It will either be ``none`` if the device is not active in the array (i.e. is a spare or has failed) or an integer less than the ``raid_disks`` number for the array indicating which position it currently fills. This can only be set while assembling an array. A device for which this is set is assumed to be working. ”h]”(hÔ)”}”(hŒslot”h]”hŒslot”…””}”(hjÝhjÛhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÓhŸh¶h M$hj×ubhä)”}”(hhh]”hé)”}”(hXsThis gives the role that the device has in the array. It will either be ``none`` if the device is not active in the array (i.e. is a spare or has failed) or an integer less than the ``raid_disks`` number for the array indicating which position it currently fills. This can only be set while assembling an array. A device for which this is set is assumed to be working.”h]”(hŒIThis gives the role that the device has in the array. It will either be ”…””}”(hŒIThis gives the role that the device has in the array. It will either be ”hjìhžhhŸNh Nubj‡)”}”(hŒ``none``”h]”hŒnone”…””}”(hhhjõhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j†hjìubhŒf if the device is not active in the array (i.e. is a spare or has failed) or an integer less than the ”…””}”(hŒf if the device is not active in the array (i.e. is a spare or has failed) or an integer less than the ”hjìhžhhŸNh Nubj‡)”}”(hŒ``raid_disks``”h]”hŒ raid_disks”…””}”(hhhjhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j†hjìubhŒ® number for the array indicating which position it currently fills. This can only be set while assembling an array. A device for which this is set is assumed to be working.”…””}”(hŒ® number for the array indicating which position it currently fills. This can only be set while assembling an array. A device for which this is set is assumed to be working.”hjìhžhhŸNh Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h Mhjéubah}”(h]”h ]”h"]”h$]”h&]”uh1hãhj×ubeh}”(h]”h ]”h"]”h$]”h&]”uh1hÍhŸh¶h M$hj%ubhÎ)”}”(hŒìoffset This gives the location in the device (in sectors from the start) where data from the array will be stored. Any part of the device before this offset is not touched, unless it is used for storing metadata (Formats 1.1 and 1.2). ”h]”(hÔ)”}”(hŒoffset”h]”hŒoffset”…””}”(hj3hj1hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÓhŸh¶h M*hj-ubhä)”}”(hhh]”hé)”}”(hŒäThis gives the location in the device (in sectors from the start) where data from the array will be stored. Any part of the device before this offset is not touched, unless it is used for storing metadata (Formats 1.1 and 1.2).”h]”hŒäThis gives the location in the device (in sectors from the start) where data from the array will be stored. Any part of the device before this offset is not touched, unless it is used for storing metadata (Formats 1.1 and 1.2).”…””}”(hjDhjBhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h M'hj?ubah}”(h]”h ]”h"]”h$]”h&]”uh1hãhj-ubeh}”(h]”h ]”h"]”h$]”h&]”uh1hÍhŸh¶h M*hj%ubhÎ)”}”(hXsize The amount of the device, after the offset, that can be used for storage of data. This will normally be the same as the component_size. This can be written while assembling an array. If a value less than the current component_size is written, it will be rejected. ”h]”(hÔ)”}”(hŒsize”h]”hŒsize”…””}”(hjbhj`hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÓhŸh¶h M1hj\ubhä)”}”(hhh]”hé)”}”(hX The amount of the device, after the offset, that can be used for storage of data. This will normally be the same as the component_size. This can be written while assembling an array. If a value less than the current component_size is written, it will be rejected.”h]”hX The amount of the device, after the offset, that can be used for storage of data. This will normally be the same as the component_size. This can be written while assembling an array. If a value less than the current component_size is written, it will be rejected.”…””}”(hjshjqhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h M-hjnubah}”(h]”h ]”h"]”h$]”h&]”uh1hãhj\ubeh}”(h]”h ]”h"]”h$]”h&]”uh1hÍhŸh¶h M1hj%ubhÎ)”}”(hXªrecovery_start When the device is not ``in_sync``, this records the number of sectors from the start of the device which are known to be correct. This is normally zero, but during a recovery operation it will steadily increase, and if the recovery is interrupted, restoring this value can cause recovery to avoid repeating the earlier blocks. With v1.x metadata, this value is saved and restored automatically. This can be set whenever the device is not an active member of the array, either before the array is activated, or before the ``slot`` is set. Setting this to ``none`` is equivalent to setting ``in_sync``. Setting to any other value also clears the ``in_sync`` flag. ”h]”(hÔ)”}”(hŒrecovery_start”h]”hŒrecovery_start”…””}”(hj‘hjhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÓhŸh¶h MAhj‹ubhä)”}”(hhh]”(hé)”}”(hXWhen the device is not ``in_sync``, this records the number of sectors from the start of the device which are known to be correct. This is normally zero, but during a recovery operation it will steadily increase, and if the recovery is interrupted, restoring this value can cause recovery to avoid repeating the earlier blocks. With v1.x metadata, this value is saved and restored automatically.”h]”(hŒWhen the device is not ”…””}”(hŒWhen the device is not ”hj hžhhŸNh Nubj‡)”}”(hŒ``in_sync``”h]”hŒin_sync”…””}”(hhhj©hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j†hj ubhXk, this records the number of sectors from the start of the device which are known to be correct. This is normally zero, but during a recovery operation it will steadily increase, and if the recovery is interrupted, restoring this value can cause recovery to avoid repeating the earlier blocks. With v1.x metadata, this value is saved and restored automatically.”…””}”(hXk, this records the number of sectors from the start of the device which are known to be correct. This is normally zero, but during a recovery operation it will steadily increase, and if the recovery is interrupted, restoring this value can cause recovery to avoid repeating the earlier blocks. With v1.x metadata, this value is saved and restored automatically.”hj hžhhŸNh Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h M4hjubhé)”}”(hŒŽThis can be set whenever the device is not an active member of the array, either before the array is activated, or before the ``slot`` is set.”h]”(hŒ~This can be set whenever the device is not an active member of the array, either before the array is activated, or before the ”…””}”(hŒ~This can be set whenever the device is not an active member of the array, either before the array is activated, or before the ”hjÂhžhhŸNh Nubj‡)”}”(hŒ``slot``”h]”hŒslot”…””}”(hhhjËhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j†hjÂubhŒ is set.”…””}”(hŒ is set.”hjÂhžhhŸNh Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h Mhj<hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÓhŸh¶h MHhj8ubhä)”}”(hhh]”hé)”}”(hXThis gives the list of all known bad blocks in the form of start address and length (in sectors respectively). If output is too big to fit in a page, it will be truncated. Writing ``sector length`` to this file adds new acknowledged (i.e. recorded to disk safely) bad blocks.”h]”(hŒ´This gives the list of all known bad blocks in the form of start address and length (in sectors respectively). If output is too big to fit in a page, it will be truncated. Writing ”…””}”(hŒ´This gives the list of all known bad blocks in the form of start address and length (in sectors respectively). If output is too big to fit in a page, it will be truncated. Writing ”hjMhžhhŸNh Nubj‡)”}”(hŒ``sector length``”h]”hŒ sector length”…””}”(hhhjVhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j†hjMubhŒN to this file adds new acknowledged (i.e. recorded to disk safely) bad blocks.”…””}”(hŒN to this file adds new acknowledged (i.e. recorded to disk safely) bad blocks.”hjMhžhhŸNh Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h MDhjJubah}”(h]”h ]”h"]”h$]”h&]”uh1hãhj8ubeh}”(h]”h ]”h"]”h$]”h&]”uh1hÍhŸh¶h MHhj%ubhÎ)”}”(hXunacknowledged_bad_blocks This gives the list of known-but-not-yet-saved-to-disk bad blocks in the same form of ``bad_blocks``. If output is too big to fit in a page, it will be truncated. Writing to this file adds bad blocks without acknowledging them. This is largely for testing. ”h]”(hÔ)”}”(hŒunacknowledged_bad_blocks”h]”hŒunacknowledged_bad_blocks”…””}”(hjhjhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÓhŸh¶h MOhj{ubhä)”}”(hhh]”hé)”}”(hXThis gives the list of known-but-not-yet-saved-to-disk bad blocks in the same form of ``bad_blocks``. If output is too big to fit in a page, it will be truncated. Writing to this file adds bad blocks without acknowledging them. This is largely for testing.”h]”(hŒVThis gives the list of known-but-not-yet-saved-to-disk bad blocks in the same form of ”…””}”(hŒVThis gives the list of known-but-not-yet-saved-to-disk bad blocks in the same form of ”hjhžhhŸNh Nubj‡)”}”(hŒ``bad_blocks``”h]”hŒ bad_blocks”…””}”(hhhj™hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j†hjubhŒœ. If output is too big to fit in a page, it will be truncated. Writing to this file adds bad blocks without acknowledging them. This is largely for testing.”…””}”(hŒœ. If output is too big to fit in a page, it will be truncated. Writing to this file adds bad blocks without acknowledging them. This is largely for testing.”hjhžhhŸNh Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h MKhjubah}”(h]”h ]”h"]”h$]”h&]”uh1hãhj{ubeh}”(h]”h ]”h"]”h$]”h&]”uh1hÍhŸh¶h MOhj%ubhÎ)”}”(hŒnppl_sector, ppl_size Location and size (in sectors) of the space used for Partial Parity Log on this device. ”h]”(hÔ)”}”(hŒppl_sector, ppl_size”h]”hŒppl_sector, ppl_size”…””}”(hjÄhjÂhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÓhŸh¶h MThj¾ubhä)”}”(hhh]”hé)”}”(hŒWLocation and size (in sectors) of the space used for Partial Parity Log on this device.”h]”hŒWLocation and size (in sectors) of the space used for Partial Parity Log on this device.”…””}”(hjÕhjÓhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h MRhjÐubah}”(h]”h ]”h"]”h$]”h&]”uh1hãhj¾ubeh}”(h]”h ]”h"]”h$]”h&]”uh1hÍhŸh¶h MThj%ubeh}”(h]”h ]”h"]”h$]”h&]”uh1hÈhj"ubah}”(h]”h ]”h"]”h$]”h&]”uh1jíhjihžhhŸNh Nubhé)”}”(hŒfAn active md device will also contain an entry for each active device in the array. These are named::”h]”hŒeAn active md device will also contain an entry for each active device in the array. These are named:”…””}”(hŒeAn active md device will also contain an entry for each active device in the array. These are named:”hjùhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h MVhjihžhubj4)”}”(hŒrdNN”h]”hŒrdNN”…””}”(hhhjubah}”(h]”h ]”h"]”h$]”h&]”jCjDuh1j3hŸh¶h MYhjihžhubhé)”}”(hŒÂwhere ``NN`` is the position in the array, starting from 0. So for a 3 drive array there will be rd0, rd1, rd2. These are symbolic links to the appropriate ``dev-XXX`` entry. Thus, for example::”h]”(hŒwhere ”…””}”(hŒwhere ”hjhžhhŸNh Nubj‡)”}”(hŒ``NN``”h]”hŒNN”…””}”(hhhjhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j†hjubhŒ is the position in the array, starting from 0. So for a 3 drive array there will be rd0, rd1, rd2. These are symbolic links to the appropriate ”…””}”(hŒ is the position in the array, starting from 0. So for a 3 drive array there will be rd0, rd1, rd2. These are symbolic links to the appropriate ”hjhžhhŸNh Nubj‡)”}”(hŒ``dev-XXX``”h]”hŒdev-XXX”…””}”(hhhj2hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j†hjubhŒ entry. Thus, for example:”…””}”(hŒ entry. Thus, for example:”hjhžhhŸNh Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h M[hjihžhubj4)”}”(hŒcat /sys/block/md*/md/rd*/state”h]”hŒcat /sys/block/md*/md/rd*/state”…””}”(hhhjKubah}”(h]”h ]”h"]”h$]”h&]”jCjDuh1j3hŸh¶h M`hjihžhubhé)”}”(hŒ$will show ``in_sync`` on every line.”h]”(hŒ will show ”…””}”(hŒ will show ”hjYhžhhŸNh Nubj‡)”}”(hŒ``in_sync``”h]”hŒin_sync”…””}”(hhhjbhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j†hjYubhŒ on every line.”…””}”(hŒ on every line.”hjYhžhhŸNh Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h Mbhjihžhubhé)”}”(hŒPActive md devices for levels that support data redundancy (1,4,5,6,10) also have”h]”hŒPActive md devices for levels that support data redundancy (1,4,5,6,10) also have”…””}”(hj}hj{hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h Mfhjihžhubjî)”}”(hhh]”hÉ)”}”(hhh]”(hÎ)”}”(hXCsync_action a text file that can be used to monitor and control the rebuild process. It contains one word which can be one of: resync redundancy is being recalculated after unclean shutdown or creation recover a hot spare is being built to replace a failed/missing device idle nothing is happening check A full check of redundancy was requested and is happening. This reads all blocks and checks them. A repair may also happen for some raid levels. repair A full check and repair is happening. This is similar to ``resync``, but was requested by the user, and the write-intent bitmap is NOT used to optimise the process. This file is writable, and each of the strings that could be read are meaningful for writing. ``idle`` will stop an active resync/recovery etc. There is no guarantee that another resync/recovery may not be automatically started again, though some event will be needed to trigger this. ``resync`` or ``recovery`` can be used to restart the corresponding operation if it was stopped with ``idle``. ``check`` and ``repair`` will start the appropriate process providing the current state is ``idle``. This file responds to select/poll. Any important change in the value triggers a poll event. Sometimes the value will briefly be ``recover`` if a recovery seems to be needed, but cannot be achieved. In that case, the transition to ``recover`` isn't notified, but the transition away is. ”h]”(hÔ)”}”(hŒsync_action”h]”hŒsync_action”…””}”(hj•hj“hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÓhŸh¶h M•hjubhä)”}”(hhh]”(hé)”}”(hŒsa text file that can be used to monitor and control the rebuild process. It contains one word which can be one of:”h]”hŒsa text file that can be used to monitor and control the rebuild process. It contains one word which can be one of:”…””}”(hj¦hj¤hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h Mjhj¡ubjî)”}”(hhh]”(jî)”}”(hhh]”hÉ)”}”(hhh]”(hÎ)”}”(hŒKresync redundancy is being recalculated after unclean shutdown or creation ”h]”(hÔ)”}”(hŒresync”h]”hŒresync”…””}”(hjÁhj¿hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÓhŸh¶h Mohj»ubhä)”}”(hhh]”hé)”}”(hŒCredundancy is being recalculated after unclean shutdown or creation”h]”hŒCredundancy is being recalculated after unclean shutdown or creation”…””}”(hjÒhjÐhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h MnhjÍubah}”(h]”h ]”h"]”h$]”h&]”uh1hãhj»ubeh}”(h]”h ]”h"]”h$]”h&]”uh1hÍhŸh¶h Mohj¸ubhÎ)”}”(hŒFrecover a hot spare is being built to replace a failed/missing device ”h]”(hÔ)”}”(hŒrecover”h]”hŒrecover”…””}”(hjðhjîhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÓhŸh¶h Mshjêubhä)”}”(hhh]”hé)”}”(hŒ=a hot spare is being built to replace a failed/missing device”h]”hŒ=a hot spare is being built to replace a failed/missing device”…””}”(hjhjÿhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h Mrhjüubah}”(h]”h ]”h"]”h$]”h&]”uh1hãhjêubeh}”(h]”h ]”h"]”h$]”h&]”uh1hÍhŸh¶h Mshj¸ubhÎ)”}”(hŒidle nothing is happening”h]”(hÔ)”}”(hŒidle”h]”hŒidle”…””}”(hjhjhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÓhŸh¶h Muhjubhä)”}”(hhh]”hé)”}”(hŒnothing is happening”h]”hŒnothing is happening”…””}”(hj0hj.hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h Mvhj+ubah}”(h]”h ]”h"]”h$]”h&]”uh1hãhjubeh}”(h]”h ]”h"]”h$]”h&]”uh1hÍhŸh¶h Muhj¸ubhÎ)”}”(hŒ˜check A full check of redundancy was requested and is happening. This reads all blocks and checks them. A repair may also happen for some raid levels. ”h]”(hÔ)”}”(hŒcheck”h]”hŒcheck”…””}”(hjNhjLhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÓhŸh¶h M{hjHubhä)”}”(hhh]”hé)”}”(hŒ‘A full check of redundancy was requested and is happening. This reads all blocks and checks them. A repair may also happen for some raid levels.”h]”hŒ‘A full check of redundancy was requested and is happening. This reads all blocks and checks them. A repair may also happen for some raid levels.”…””}”(hj_hj]hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h MxhjZubah}”(h]”h ]”h"]”h$]”h&]”uh1hãhjHubeh}”(h]”h ]”h"]”h$]”h&]”uh1hÍhŸh¶h M{hj¸ubhÎ)”}”(hŒrepair A full check and repair is happening. This is similar to ``resync``, but was requested by the user, and the write-intent bitmap is NOT used to optimise the process. ”h]”(hÔ)”}”(hŒrepair”h]”hŒrepair”…””}”(hj}hj{hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÓhŸh¶h Mhjwubhä)”}”(hhh]”hé)”}”(hŒ¥A full check and repair is happening. This is similar to ``resync``, but was requested by the user, and the write-intent bitmap is NOT used to optimise the process.”h]”(hŒ:A full check and repair is happening. This is similar to ”…””}”(hŒ:A full check and repair is happening. This is similar to ”hjŒhžhhŸNh Nubj‡)”}”(hŒ ``resync``”h]”hŒresync”…””}”(hhhj•hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j†hjŒubhŒa, but was requested by the user, and the write-intent bitmap is NOT used to optimise the process.”…””}”(hŒa, but was requested by the user, and the write-intent bitmap is NOT used to optimise the process.”hjŒhžhhŸNh Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h M~hj‰ubah}”(h]”h ]”h"]”h$]”h&]”uh1hãhjwubeh}”(h]”h ]”h"]”h$]”h&]”uh1hÍhŸh¶h Mhj¸ubeh}”(h]”h ]”h"]”h$]”h&]”uh1hÈhjµubah}”(h]”h ]”h"]”h$]”h&]”uh1jíhj²ubhé)”}”(hŒ]This file is writable, and each of the strings that could be read are meaningful for writing.”h]”hŒ]This file is writable, and each of the strings that could be read are meaningful for writing.”…””}”(hjÈhjÆhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h Mƒhj²ubjî)”}”(hhh]”(hé)”}”(hŒ¿``idle`` will stop an active resync/recovery etc. There is no guarantee that another resync/recovery may not be automatically started again, though some event will be needed to trigger this.”h]”(j‡)”}”(hŒ``idle``”h]”hŒidle”…””}”(hhhjÛhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j†hj×ubhŒ· will stop an active resync/recovery etc. There is no guarantee that another resync/recovery may not be automatically started again, though some event will be needed to trigger this.”…””}”(hŒ· will stop an active resync/recovery etc. There is no guarantee that another resync/recovery may not be automatically started again, though some event will be needed to trigger this.”hj×hžhhŸNh Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h M†hjÔubhé)”}”(hŒn``resync`` or ``recovery`` can be used to restart the corresponding operation if it was stopped with ``idle``.”h]”(j‡)”}”(hŒ ``resync``”h]”hŒresync”…””}”(hhhjøhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j†hjôubhŒ or ”…””}”(hŒ or ”hjôhžhhŸNh Nubj‡)”}”(hŒ``recovery``”h]”hŒrecovery”…””}”(hhhjhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j†hjôubhŒK can be used to restart the corresponding operation if it was stopped with ”…””}”(hŒK can be used to restart the corresponding operation if it was stopped with ”hjôhžhhŸNh Nubj‡)”}”(hŒ``idle``”h]”hŒidle”…””}”(hhhjhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j†hjôubhŒ.”…””}”(hj>hjôhžhhŸNh Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h M‹hjÔubhé)”}”(hŒd``check`` and ``repair`` will start the appropriate process providing the current state is ``idle``.”h]”(j‡)”}”(hŒ ``check``”h]”hŒcheck”…””}”(hhhj:hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j†hj6ubhŒ and ”…””}”(hŒ and ”hj6hžhhŸNh Nubj‡)”}”(hŒ ``repair``”h]”hŒrepair”…””}”(hhhjMhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j†hj6ubhŒC will start the appropriate process providing the current state is ”…””}”(hŒC will start the appropriate process providing the current state is ”hj6hžhhŸNh Nubj‡)”}”(hŒ``idle``”h]”hŒidle”…””}”(hhhj`hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j†hj6ubhŒ.”…””}”(hj>hj6hžhhŸNh Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h MŽhjÔubeh}”(h]”h ]”h"]”h$]”h&]”uh1jíhj²ubhé)”}”(hXThis file responds to select/poll. Any important change in the value triggers a poll event. Sometimes the value will briefly be ``recover`` if a recovery seems to be needed, but cannot be achieved. In that case, the transition to ``recover`` isn't notified, but the transition away is.”h]”(hŒ‚This file responds to select/poll. Any important change in the value triggers a poll event. Sometimes the value will briefly be ”…””}”(hŒ‚This file responds to select/poll. Any important change in the value triggers a poll event. Sometimes the value will briefly be ”hj~hžhhŸNh Nubj‡)”}”(hŒ``recover``”h]”hŒrecover”…””}”(hhhj‡hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j†hj~ubhŒ[ if a recovery seems to be needed, but cannot be achieved. In that case, the transition to ”…””}”(hŒ[ if a recovery seems to be needed, but cannot be achieved. In that case, the transition to ”hj~hžhhŸNh Nubj‡)”}”(hŒ``recover``”h]”hŒrecover”…””}”(hhhjšhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j†hj~ubhŒ. isnâ€™t notified, but the transition away is.”…””}”(hŒ, isn't notified, but the transition away is.”hj~hžhhŸNh Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h M‘hj²ubeh}”(h]”h ]”h"]”h$]”h&]”uh1jíhj¡ubeh}”(h]”h ]”h"]”h$]”h&]”uh1hãhjubeh}”(h]”h ]”h"]”h$]”h&]”uh1hÍhŸh¶h M•hjŒubhÎ)”}”(hX(degraded This contains a count of the number of devices by which the arrays is degraded. So an optimal array will show ``0``. A single failed/missing drive will show ``1``, etc. This file responds to select/poll, any increase or decrease in the count of missing devices will trigger an event. ”h]”(hÔ)”}”(hŒdegraded”h]”hŒdegraded”…””}”(hjËhjÉhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÓhŸh¶h MhjÅubhä)”}”(hhh]”(hé)”}”(hŒªThis contains a count of the number of devices by which the arrays is degraded. So an optimal array will show ``0``. A single failed/missing drive will show ``1``, etc.”h]”(hŒoThis contains a count of the number of devices by which the arrays is degraded. So an optimal array will show ”…””}”(hŒoThis contains a count of the number of devices by which the arrays is degraded. So an optimal array will show ”hjÚhžhhŸNh Nubj‡)”}”(hŒ``0``”h]”hŒ0”…””}”(hhhjãhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j†hjÚubhŒ+. A single failed/missing drive will show ”…””}”(hŒ+. A single failed/missing drive will show ”hjÚhžhhŸNh Nubj‡)”}”(hŒ``1``”h]”hŒ1”…””}”(hhhjöhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j†hjÚubhŒ, etc.”…””}”(hŒ, etc.”hjÚhžhhŸNh Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h M˜hj×ubhé)”}”(hŒrThis file responds to select/poll, any increase or decrease in the count of missing devices will trigger an event.”h]”hŒrThis file responds to select/poll, any increase or decrease in the count of missing devices will trigger an event.”…””}”(hjhjhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h Mœhj×ubeh}”(h]”h ]”h"]”h$]”h&]”uh1hãhjÅubeh}”(h]”h ]”h"]”h$]”h&]”uh1hÍhŸh¶h MhjŒubhÎ)”}”(hX·mismatch_count When performing ``check`` and ``repair``, and possibly when performing ``resync``, md will count the number of errors that are found. The count in ``mismatch_cnt`` is the number of sectors that were re-written, or (for ``check``) would have been re-written. As most raid levels work in units of pages rather than sectors, this may be larger than the number of actual errors by a factor of the number of sectors in a page. ”h]”(hÔ)”}”(hŒmismatch_count”h]”hŒmismatch_count”…””}”(hj/hj-hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÓhŸh¶h M¦hj)ubhä)”}”(hhh]”hé)”}”(hX§When performing ``check`` and ``repair``, and possibly when performing ``resync``, md will count the number of errors that are found. The count in ``mismatch_cnt`` is the number of sectors that were re-written, or (for ``check``) would have been re-written. As most raid levels work in units of pages rather than sectors, this may be larger than the number of actual errors by a factor of the number of sectors in a page.”h]”(hŒWhen performing ”…””}”(hŒWhen performing ”hj>hžhhŸNh Nubj‡)”}”(hŒ ``check``”h]”hŒcheck”…””}”(hhhjGhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j†hj>ubhŒ and ”…””}”(hŒ and ”hj>hžhhŸNh Nubj‡)”}”(hŒ ``repair``”h]”hŒrepair”…””}”(hhhjZhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j†hj>ubhŒ, and possibly when performing ”…””}”(hŒ, and possibly when performing ”hj>hžhhŸNh Nubj‡)”}”(hŒ ``resync``”h]”hŒresync”…””}”(hhhjmhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j†hj>ubhŒC, md will count the number of errors that are found. The count in ”…””}”(hŒC, md will count the number of errors that are found. The count in ”hj>hžhhŸNh Nubj‡)”}”(hŒ``mismatch_cnt``”h]”hŒmismatch_cnt”…””}”(hhhj€hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j†hj>ubhŒ8 is the number of sectors that were re-written, or (for ”…””}”(hŒ8 is the number of sectors that were re-written, or (for ”hj>hžhhŸNh Nubj‡)”}”(hŒ ``check``”h]”hŒcheck”…””}”(hhhj“hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j†hj>ubhŒÂ) would have been re-written. As most raid levels work in units of pages rather than sectors, this may be larger than the number of actual errors by a factor of the number of sectors in a page.”…””}”(hŒÂ) would have been re-written. As most raid levels work in units of pages rather than sectors, this may be larger than the number of actual errors by a factor of the number of sectors in a page.”hj>hžhhŸNh Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h M hj;ubah}”(h]”h ]”h"••S]”h$]”h&]”uh1hãhj)ubeh}”(h]”h ]”h"]”h$]”h&]”uh1hÍhŸh¶h M¦hjŒubhÎ)”}”(hX˜bitmap_set_bits If the array has a write-intent bitmap, then writing to this attribute can set bits in the bitmap, indicating that a resync would need to check the corresponding blocks. Either individual numbers or start-end pairs can be written. Multiple numbers can be separated by a space. Note that the numbers are ``bit`` numbers, not ``block`` numbers. They should be scaled by the bitmap_chunksize. ”h]”(hÔ)”}”(hŒbitmap_set_bits”h]”hŒbitmap_set_bits”…””}”(hj¾hj¼hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÓhŸh¶h M°hj¸ubhä)”}”(hhh]”(hé)”}”(hXIf the array has a write-intent bitmap, then writing to this attribute can set bits in the bitmap, indicating that a resync would need to check the corresponding blocks. Either individual numbers or start-end pairs can be written. Multiple numbers can be separated by a space.”h]”hXIf the array has a write-intent bitmap, then writing to this attribute can set bits in the bitmap, indicating that a resync would need to check the corresponding blocks. Either individual numbers or start-end pairs can be written. Multiple numbers can be separated by a space.”…””}”(hjÏhjÍhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h M©hjÊubhé)”}”(hŒpNote that the numbers are ``bit`` numbers, not ``block`` numbers. They should be scaled by the bitmap_chunksize.”h]”(hŒNote that the numbers are ”…””}”(hŒNote that the numbers are ”hjÛhžhhŸNh Nubj‡)”}”(hŒ``bit``”h]”hŒbit”…””}”(hhhjähžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j†hjÛubhŒ numbers, not ”…””}”(hŒ numbers, not ”hjÛhžhhŸNh Nubj‡)”}”(hŒ ``block``”h]”hŒblock”…””}”(hhhj÷hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j†hjÛubhŒ8 numbers. They should be scaled by the bitmap_chunksize.”…””}”(hŒ8 numbers. They should be scaled by the bitmap_chunksize.”hjÛhžhhŸNh Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h M¯hjÊubeh}”(h]”h ]”h"]”h$]”h&]”uh1hãhj¸ubeh}”(h]”h ]”h"]”h$]”h&]”uh1hÍhŸh¶h M°hjŒubhÎ)”}”(hXësync_speed_min, sync_speed_max This are similar to ``/proc/sys/dev/raid/speed_limit_{min,max}`` however they only apply to the particular array. If no value has been written to these, or if the word ``system`` is written, then the system-wide value is used. If a value, in kibibytes-per-second is written, then it is used. When the files are read, they show the currently active value followed by ``(local)`` or ``(system)`` depending on whether it is a locally set or system-wide value. ”h]”(hÔ)”}”(hŒsync_speed_min, sync_speed_max”h]”hŒsync_speed_min, sync_speed_max”…””}”(hj"hj hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÓhŸh¶h M¼hjubhä)”}”(hhh]”(hé)”}”(hŒqThis are similar to ``/proc/sys/dev/raid/speed_limit_{min,max}`` however they only apply to the particular array.”h]”(hŒThis are similar to ”…””}”(hŒThis are similar to ”hj1hžhhŸNh Nubj‡)”}”(hŒ,``/proc/sys/dev/raid/speed_limit_{min,max}``”h]”hŒ(/proc/sys/dev/raid/speed_limit_{min,max}”…””}”(hhhj:hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j†hj1ubhŒ1 however they only apply to the particular array.”…””}”(hŒ1 however they only apply to the particular array.”hj1hžhhŸNh Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h M³hj.ubhé)”}”(hŒ²If no value has been written to these, or if the word ``system`` is written, then the system-wide value is used. If a value, in kibibytes-per-second is written, then it is used.”h]”(hŒ6If no value has been written to these, or if the word ”…””}”(hŒ6If no value has been written to these, or if the word ”hjShžhhŸNh Nubj‡)”}”(hŒ ``system``”h]”hŒsystem”…””}”(hhhj\hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j†hjSubhŒr is written, then the system-wide value is used. If a value, in kibibytes-per-second is written, then it is used.”…””}”(hŒr is written, then the system-wide value is used. If a value, in kibibytes-per-second is written, then it is used.”hjShžhhŸNh Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h M¶hj.ubhé)”}”(hŒ¤When the files are read, they show the currently active value followed by ``(local)`` or ``(system)`` depending on whether it is a locally set or system-wide value.”h]”(hŒJWhen the files are read, they show the currently active value followed by ”…””}”(hŒJWhen the files are read, they show the currently active value followed by ”hjuhžhhŸNh Nubj‡)”}”(hŒ``(local)``”h]”hŒ(local)”…””}”(hhhj~hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j†hjuubhŒ or ”…””}”(hŒ or ”hjuhžhhŸNh Nubj‡)”}”(hŒ``(system)``”h]”hŒ(system)”…””}”(hhhj‘hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j†hjuubhŒ? depending on whether it is a locally set or system-wide value.”…””}”(hŒ? depending on whether it is a locally set or system-wide value.”hjuhžhhŸNh Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h Mºhj.ubeh}”(h]”h ]”h"]”h$]”h&]”uh1hãhjubeh}”(h]”h ]”h"]”h$]”h&]”uh1hÍhŸh¶h M¼hjŒubhÎ)”}”(hXÅsync_completed This shows the number of sectors that have been completed of whatever the current sync_action is, followed by the number of sectors in total that could need to be processed. The two numbers are separated by a ``/`` thus effectively showing one value, a fraction of the process that is complete. A ``select`` on this attribute will return when resync completes, when it reaches the current sync_max (below) and possibly at other times. ”h]”(hÔ)”}”(hŒsync_completed”h]”hŒsync_completed”…””}”(hj¼hjºhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÓhŸh¶h MÇhj¶ubhä)”}”(hhh]”(hé)”}”(hX(This shows the number of sectors that have been completed of whatever the current sync_action is, followed by the number of sectors in total that could need to be processed. The two numbers are separated by a ``/`` thus effectively showing one value, a fraction of the process that is complete.”h]”(hŒÒThis shows the number of sectors that have been completed of whatever the current sync_action is, followed by the number of sectors in total that could need to be processed. The two numbers are separated by a ”…””}”(hŒÒThis shows the number of sectors that have been completed of whatever the current sync_action is, followed by the number of sectors in total that could need to be processed. The two numbers are separated by a ”hjËhžhhŸNh Nubj‡)”}”(hŒ``/``”h]”hŒ/”…””}”(hhhjÔhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j†hjËubhŒQ thus effectively showing one value, a fraction of the process that is complete.”…””}”(hŒQ thus effectively showing one value, a fraction of the process that is complete.”hjËhžhhŸNh Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h M¿hjÈubhé)”}”(hŒ‹A ``select`` on this attribute will return when resync completes, when it reaches the current sync_max (below) and possibly at other times.”h]”(hŒA ”…””}”(hŒA ”hjíhžhhŸNh Nubj‡)”}”(hŒ ``select``”h]”hŒselect”…””}”(hhhjöhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j†hjíubhŒ on this attribute will return when resync completes, when it reaches the current sync_max (below) and possibly at other times.”…””}”(hŒ on this attribute will return when resync completes, when it reaches the current sync_max (below) and possibly at other times.”hjíhžhhŸNh Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h MÅhjÈubeh}”(h]”h ]”h"]”h$]”h&]”uh1hãhj¶ubeh}”(h]”h ]”h"]”h$]”h&]”uh1hÍhŸh¶h MÇhjŒubhÎ)”}”(hŒ€sync_speed This shows the current actual speed, in K/sec, of the current sync_action. It is averaged over the last 30 seconds. ”h]”(hÔ)”}”(hŒ sync_speed”h]”hŒ sync_speed”…””}”(hj! hj hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÓhŸh¶h MËhj ubhä)”}”(hhh]”hé)”}”(hŒtThis shows the current actual speed, in K/sec, of the current sync_action. It is averaged over the last 30 seconds.”h]”hŒtThis shows the current actual speed, in K/sec, of the current sync_action. It is averaged over the last 30 seconds.”…””}”(hj2 hj0 hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h MÊhj- ubah}”(h]”h ]”h"]”h$]”h&]”uh1hãhj ubeh}”(h]”h ]”h"]”h$]”h&]”uh1hÍhŸh¶h MËhjŒubhÎ)”}”(hŒ±suspend_lo, suspend_hi The two values, given as numbers of sectors, indicate a range within the array where IO will be blocked. This is currently only supported for raid4/5/6. ”h]”(hÔ)”}”(hŒsuspend_lo, suspend_hi”h]”hŒsuspend_lo, suspend_hi”…””}”(hjP hjN hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÓhŸh¶h MÐhjJ ubhä)”}”(hhh]”hé)”}”(hŒ™The two values, given as numbers of sectors, indicate a range within the array where IO will be blocked. This is currently only supported for raid4/5/6.”h]”hŒ™The two values, given as numbers of sectors, indicate a range within the array where IO will be blocked. This is currently only supported for raid4/5/6.”…””}”(hja hj_ hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h MÎhj\ ubah}”(h]”h ]”h"]”h$]”h&]”uh1hãhjJ ubeh}”(h]”h ]”h"]”h$]”h&]”uh1hÍhŸh¶h MÐhjŒubhÎ)”}”(hXvsync_min, sync_max The two values, given as numbers of sectors, indicate a range within the array where ``check``/``repair`` will operate. Must be a multiple of chunk_size. When it reaches ``sync_max`` it will pause, rather than complete. You can use ``select`` or ``poll`` on ``sync_completed`` to wait for that number to reach sync_max. Then you can either increase ``sync_max``, or can write ``idle`` to ``sync_action``. The value of ``max`` for ``sync_max`` effectively disables the limit. When a resync is active, the value can only ever be increased, never decreased. The value of ``0`` is the minimum for ``sync_min``. ”h]”(hÔ)”}”(hŒsync_min, sync_max”h]”hŒsync_min, sync_max”…””}”(hj hj} hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÓhŸh¶h Màhjy ubhä)”}”(hhh]”(hé)”}”(hX•The two values, given as numbers of sectors, indicate a range within the array where ``check``/``repair`` will operate. Must be a multiple of chunk_size. When it reaches ``sync_max`` it will pause, rather than complete. You can use ``select`` or ``poll`` on ``sync_completed`` to wait for that number to reach sync_max. Then you can either increase ``sync_max``, or can write ``idle`` to ``sync_action``.”h]”(hŒUThe two values, given as numbers of sectors, indicate a range within the array where ”…””}”(hŒUThe two values, given as numbers of sectors, indicate a range within the array where ”hjŽ hžhhŸNh Nubj‡)”}”(hŒ ``check``”h]”hŒcheck”…””}”(hhhj— hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j†hjŽ ubhŒ/”…””}”(hŒ/”hjŽ hžhhŸNh Nubj‡)”}”(hŒ ``repair``”h]”hŒrepair”…””}”(hhhjª hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j†hjŽ ubhŒA will operate. Must be a multiple of chunk_size. When it reaches ”…””}”(hŒA will operate. Must be a multiple of chunk_size. When it reaches ”hjŽ hžhhŸNh Nubj‡)”}”(hŒ``sync_max``”h]”hŒsync_max”…””}”(hhhj½ hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j†hjŽ ubhŒ2 it will pause, rather than complete. You can use ”…””}”(hŒ2 it will pause, rather than complete. You can use ”hjŽ hžhhŸNh Nubj‡)”}”(hŒ ``select``”h]”hŒselect”…””}”(hhhjÐ hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j†hjŽ ubhŒ or ”…””}”(hŒ or ”hjŽ hžhhŸNh Nubj‡)”}”(hŒ``poll``”h]”hŒpoll”…””}”(hhhjã hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j†hjŽ ubhŒ on ”…””}”(hŒ on ”hjŽ hžhhŸNh Nubj‡)”}”(hŒ``sync_completed``”h]”hŒsync_completed”…””}”(hhhjö hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j†hjŽ ubhŒJ to wait for that number to reach sync_max. Then you can either increase ”…””}”(hŒJ to wait for that number to reach sync_max. Then you can either increase ”hjŽ hžhhŸNh Nubj‡)”}”(hŒ``sync_max``”h]”hŒsync_max”…””}”(hhhj !hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j†hjŽ ubhŒ, or can write ”…””}”(hŒ, or can write ”hjŽ hžhhŸNh Nubj‡)”}”(hŒ``idle``”h]”hŒidle”…””}”(hhhj!hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j†hjŽ ubhŒ to ”…””}”(hŒ to ”hjŽ hžhhŸNh Nubj‡)”}”(hŒ``sync_action``”h]”hŒsync_action”…””}”(hhhj/!hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j†hjŽ ubhŒ.”…””}”(hj>hjŽ hžhhŸNh Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h MÓhj‹ ubhé)”}”(hŒÉThe value of ``max`` for ``sync_max`` effectively disables the limit. When a resync is active, the value can only ever be increased, never decreased. The value of ``0`` is the minimum for ``sync_min``.”h]”(hŒ The value of ”…””}”(hŒ The value of ”hjG!hžhhŸNh Nubj‡)”}”(hŒ``max``”h]”hŒmax”…””}”(hhhjP!hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j†hjG!ubhŒ for ”…””}”(hŒ for ”hjG!hžhhŸNh Nubj‡)”}”(hŒ``sync_max``”h]”hŒsync_max”…””}”(hhhjc!hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j†hjG!ubhŒ~ effectively disables the limit. When a resync is active, the value can only ever be increased, never decreased. The value of ”…””}”(hŒ~ effectively disables the limit. When a resync is active, the value can only ever be increased, never decreased. The value of ”hjG!hžhhŸNh Nubj‡)”}”(hŒ``0``”h]”hŒ0”…””}”(hhhjv!hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j†hjG!ubhŒ is the minimum for ”…””}”(hŒ is the minimum for ”hjG!hžhhŸNh Nubj‡)”}”(hŒ``sync_min``”h]”hŒsync_min”…””}”(hhhj‰!hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j†hjG!ubhŒ.”…””}”(hj>hjG!hžhhŸNh Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h MÛhj‹ ubeh}”(h]”h ]”h"]”h$]”h&]”uh1hãhjy ubeh}”(h]”h ]”h"]”h$]”h&]”uh1hÍhŸh¶h MàhjŒubeh}”(h]”h ]”h"]”h$]”h&]”uh1hÈhj‰ubah}”(h]”h ]”h"]”h$]”h&]”uh1jíhjihžhhŸNh Nubhé)”}”(hŒ×Each active md device may also have attributes specific to the personality module that manages it. These are specific to the implementation of the module and could change substantially if the implementation changes.”h]”hŒ×Each active md device may also have attributes specific to the personality module that manages it. These are specific to the implementation of the module and could change substantially if the implementation changes.”…””}”(hj»!hj¹!hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h Mâhjihžhubhé)”}”(hŒThese currently include:”h]”hŒThese currently include:”…””}”(hjÉ!hjÇ!hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h Mçhjihžhubjî)”}”(hhh]”hÉ)”}”(hhh]”(hÎ)”}”(hŒ§stripe_cache_size (currently raid5 only) number of entries in the stripe cache. This is writable, but there are upper and lower limits (32768, 17). Default is 256. ”h]”(hÔ)”}”(hŒ)stripe_cache_size (currently raid5 only)”h]”hŒ)stripe_cache_size (currently raid5 only)”…””}”(hjá!hjß!hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÓhŸh¶h MëhjÛ!ubhä)”}”(hhh]”hé)”}”(hŒ|number of entries in the stripe cache. This is writable, but there are upper and lower limits (32768, 17). Default is 256.”h]”hŒ|number of entries in the stripe cache. This is writable, but there are upper and lower limits (32768, 17). Default is 256.”…””}”(hjò!hjð!hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h Mêhjí!ubah}”(h]”h ]”h"]”h$]”h&]”uh1hãhjÛ!ubeh}”(h]”h ]”h"]”h$]”h&]”uh1hÍhŸh¶h MëhjØ!ubhÎ)”}”(hŒWstrip_cache_active (currently raid5 only) number of active entries in the stripe cache ”h]”(hÔ)”}”(hŒ)strip_cache_active (currently raid5 only)”h]”hŒ)strip_cache_active (currently raid5 only)”…””}”(hj"hj"hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÓhŸh¶h Mîhj "ubhä)”}”(hhh]”hé)”}”(hŒ,number of active entries in the stripe cache”h]”hŒ,number of active entries in the stripe cache”…””}”(hj!"hj"hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h Mîhj"ubah}”(h]”h ]”h"]”h$]”h&]”uh1hãhj "ubeh}”(h]”h ]”h"]”h$]”h&]”uh1hÍhŸh¶h MîhjØ!ubhÎ)”}”(hXcpreread_bypass_threshold (currently raid5 only) number of times a stripe requiring preread will be bypassed by a stripe that does not require preread. For fairness defaults to 1. Setting this to 0 disables bypass accounting and requires preread stripes to wait until all full-width stripe- writes are complete. Valid values are 0 to stripe_cache_size. ”h]”(hÔ)”}”(hŒ/preread_bypass_threshold (currently raid5 only)”h]”hŒ/preread_bypass_threshold (currently raid5 only)”…””}”(hj?"hj="hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÓhŸh¶h Mõhj9"ubhä)”}”(hhh]”hé)”}”(hX2number of times a stripe requiring preread will be bypassed by a stripe that does not require preread. For fairness defaults to 1. Setting this to 0 disables bypass accounting and requires preread stripes to wait until all full-width stripe- writes are complete. Valid values are 0 to stripe_cache_size.”h]”hX2number of times a stripe requiring preread will be bypassed by a stripe that does not require preread. For fairness defaults to 1. Setting this to 0 disables bypass accounting and requires preread stripes to wait until all full-width stripe- writes are complete. Valid values are 0 to stripe_cache_size.”…””}”(hjP"hjN"hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h MñhjK"ubah}”(h]”h ]”h"]”h$]”h&]”uh1hãhj9"ubeh}”(h]”h ]”h"]”h$]”h&]”uh1hÍhŸh¶h MõhjØ!ubhÎ)”}”(hŒ¿journal_mode (currently raid5 only) The cache mode for raid5. raid5 could include an extra disk for caching. The mode can be "write-throuth" and "write-back". The default is "write-through". ”h]”(hÔ)”}”(hŒ#journal_mode (currently raid5 only)”h]”hŒ#journal_mode (currently raid5 only)”…””}”(hjn"hjl"hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÓhŸh¶h Múhjh"ubhä)”}”(hhh]”hé)”}”(hŒšThe cache mode for raid5. raid5 could include an extra disk for caching. The mode can be "write-throuth" and "write-back". The default is "write-through".”h]”hŒ¦The cache mode for raid5. raid5 could include an extra disk for caching. The mode can be â€œwrite-throuthâ€ and â€œwrite-backâ€. The default is â€œwrite-throughâ€.”…””}”(hj"hj}"hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h Møhjz"ubah}”(h]”h ]”h"]”h$]”h&]”uh1hãhjh"ubeh}”(h]”h ]”h"]”h$]”h&]”uh1hÍhŸh¶h MúhjØ!ubhÎ)”}”(hŒCppl_write_hint NVMe stream ID to be set for each PPL write request.”h]”(hÔ)”}”(hŒppl_write_hint”h]”hŒppl_write_hint”…””}”(hj"hj›"hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÓhŸh¶h Mühj—"ubhä)”}”(hhh]”hé)”}”(hŒ4NVMe stream ID to be set for each PPL write request.”h]”hŒ4NVMe stream ID to be set for each PPL write request.”…””}”(hj®"hj¬"hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hèhŸh¶h Mýhj©"ubah}”(h]”h ]”h"]”h$]”h&]”uh1hãhj—"ubeh}”(h]”h ]”h"]”h$]”h&]”uh1hÍhŸh¶h MühjØ!ubeh}”(h]”h ]”h"]”h$]”h&]”uh1hÈhjÕ!ubah}”(h]”h ]”h"]”h$]”h&]”uh1jíhjihžhhŸNh Nubeh}”(h]”Œmd-devices-in-sysfs”ah ]”h"]”Œmd devices in sysfs”ah$]”h&]”uh1h¡hh£hžhhŸh¶h Kµubeh}”(h]”Œraid-arrays”ah ]”h"]”Œraid arrays”ah$]”h&]”uh1h¡hhhžhhŸh¶h Kubeh}”(h]”h ]”h"]”h$]”h&]”Œsource”h¶uh1hŒcurrent_source”NŒcurrent_line”NŒsettings”Œdocutils.frontend”ŒValues”“”)”}”(h¦NŒ generator”NŒ datestamp”NŒsource_link”NŒ source_url”NŒ toc_backlinks”jÓŒfootnote_backlinks”KŒ sectnum_xform”KŒstrip_comments”NŒstrip_elements_with_classes”NŒ strip_classes”NŒreport_level”KŒ halt_level”KŒexit_status_level”KŒdebug”NŒwarning_stream”NŒ traceback”ˆŒinput_encoding”Œ utf-8-sig”Œinput_encoding_error_handler”Œstrict”Œoutput_encoding”Œutf-8”Œoutput_encoding_error_handler”j#Œerror_encoding”ŒUTF-8”Œerror_encoding_error_handler”Œbackslashreplace”Œ language_code”Œen”Œrecord_dependencies”NŒconfig”NŒ id_prefix”hŒauto_id_prefix”Œid”Œ dump_settings”NŒdump_internals”NŒdump_transforms”NŒdump_pseudo_xml”NŒexpose_internals”NŒstrict_visitor”NŒ_disable_config”NŒ_source”h¶Œ_destination”NŒ _config_files”]”Œ7/var/lib/git/docbuild/linux/Documentation/docutils.conf”aŒpep_references”NŒpep_base_url”Œhttps://peps.python.org/”Œpep_file_url_template”Œpep-%04d”Œrfc_references”NŒrfc_base_url”Œ&https://datatracker.ietf.org/doc/html/”Œ tab_width”KŒtrim_footnote_reference_space”‰Œfile_insertion_enabled”ˆŒraw_enabled”KŒline_length_limit”M'Œsyntax_highlight”Œlong”Œsmart_quotes”ˆŒsmartquotes_locales”]”Œcharacter_level_inline_markup”‰Œdoctitle_xform”‰Œ docinfo_xform”KŒsectsubtitle_xform”‰Œ image_loading”Œlink”Œembed_stylesheet”‰Œcloak_email_addresses”ˆŒsection_self_link”‰Œembed_images”‰Œenv”NubŒreporter”NŒindirect_targets”]”Œsubstitution_defs”}”Œsubstitution_names”}”Œrefnames”}”Œrefids”}”Œnameids”}”(jß"jÜ"jŸjœjHjEjljijªj§jÚj×j—j”jjj¦j£j$j!jéjæjfjcj×"jÔ"uŒ nametypes”}”(jß"NjŸNjHNjlNjªNjÚNj—NjNj¦Nj$NjéNjfNj×"Nuh}”(jÜ"h£jœh·jEjjijKj§joj×jj”jÝjj¢j£jj!j©jæj'jcjìjÔ"jiuŒ footnote_refs”}”Œ citation_refs”}”Œ autofootnotes”]”Œautofootnote_refs”]”Œsymbol_footnotes”]”Œsymbol_footnote_refs”]”Œ footnotes”]”Œ citations”]”Œautofootnote_start”KŒsymbol_footnote_start”KŒ id_counter”Œcollections”ŒCounter”“”}”…”R”Œparse_messages”]”Œtransform_messages”]”Œtransformer”NŒinclude_log”]”Œ decoration”Nhžhub.