dsphinx.addnodesdocument)}( rawsourcechildren]( translations LanguagesNode)}(hhh](h pending_xref)}(hhh]docutils.nodesTextChinese (Simplified)}parenthsba attributes}(ids]classes]names]dupnames]backrefs] refdomainstdreftypedoc reftarget/translations/zh_CN/block/statmodnameN classnameN refexplicitutagnamehhh ubh)}(hhh]hChinese (Traditional)}hh2sbah}(h]h ]h"]h$]h&] refdomainh)reftypeh+ reftarget/translations/zh_TW/block/statmodnameN classnameN refexplicituh1hhh ubh)}(hhh]hItalian}hhFsbah}(h]h ]h"]h$]h&] refdomainh)reftypeh+ reftarget/translations/it_IT/block/statmodnameN classnameN refexplicituh1hhh ubh)}(hhh]hJapanese}hhZsbah}(h]h ]h"]h$]h&] refdomainh)reftypeh+ reftarget/translations/ja_JP/block/statmodnameN classnameN refexplicituh1hhh ubh)}(hhh]hKorean}hhnsbah}(h]h ]h"]h$]h&] refdomainh)reftypeh+ reftarget/translations/ko_KR/block/statmodnameN classnameN refexplicituh1hhh ubh)}(hhh]hPortuguese (Brazilian)}hhsbah}(h]h ]h"]h$]h&] refdomainh)reftypeh+ reftarget/translations/pt_BR/block/statmodnameN classnameN refexplicituh1hhh ubh)}(hhh]hSpanish}hhsbah}(h]h ]h"]h$]h&] refdomainh)reftypeh+ reftarget/translations/sp_SP/block/statmodnameN classnameN refexplicituh1hhh ubeh}(h]h ]h"]h$]h&]current_languageEnglishuh1h hh _documenthsourceNlineNubhsection)}(hhh](htitle)}(h/Block layer statistics in /sys/block//stath]h/Block layer statistics in /sys/block//stat}(hhhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhhh8/var/lib/git/docbuild/linux/Documentation/block/stat.rsthKubh paragraph)}(hCThis file documents the contents of the /sys/block//stat file.h]hCThis file documents the contents of the /sys/block//stat file.}(hhhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhKhhhhubh)}(hPThe stat file provides several statistics about the state of block device .h]hPThe stat file provides several statistics about the state of block device .}(hhhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhKhhhhubhenumerated_list)}(hhh]h list_item)}(hmWhy are there multiple statistics in a single file? Doesn't sysfs normally contain a single value per file? h]h)}(hlWhy are there multiple statistics in a single file? Doesn't sysfs normally contain a single value per file?h]hnWhy are there multiple statistics in a single file? Doesn’t sysfs normally contain a single value per file?}(hhhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhK hhubah}(h]h ]h"]h$]h&]uh1hhhhhhhhNubah}(h]h ]h"]h$]h&]enumtype upperalphaprefixhsuffix.startKuh1hhhhhhhhK ubh)}(hhh]h)}(hX1By having a single file, the kernel can guarantee that the statistics represent a consistent snapshot of the state of the device. If the statistics were exported as multiple files containing one statistic each, it would be impossible to guarantee that a set of readings represent a single point in time. h]h)}(hX0By having a single file, the kernel can guarantee that the statistics represent a consistent snapshot of the state of the device. If the statistics were exported as multiple files containing one statistic each, it would be impossible to guarantee that a set of readings represent a single point in time.h]hX0By having a single file, the kernel can guarantee that the statistics represent a consistent snapshot of the state of the device. If the statistics were exported as multiple files containing one statistic each, it would be impossible to guarantee that a set of readings represent a single point in time.}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhKhjubah}(h]h ]h"]h$]h&]uh1hhjhhhhhNubah}(h]h ]h"]h$]h&]jjjhjjuh1hhhhhhhhKubh)}(hThe stat file consists of a single line of text containing 17 decimal values separated by whitespace. The fields are summarized in the following table, and described in more detail below.h]hThe stat file consists of a single line of text containing 17 decimal values separated by whitespace. The fields are summarized in the following table, and described in more detail below.}(hj5hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhKhhhhubhtable)}(hhh]htgroup)}(hhh](hcolspec)}(hhh]h}(h]h ]h"]h$]h&]colwidthKuh1jMhjJubjN)}(hhh]h}(h]h ]h"]h$]h&]colwidthK uh1jMhjJubjN)}(hhh]h}(h]h ]h"]h$]h&]colwidthK1uh1jMhjJubhthead)}(hhh]hrow)}(hhh](hentry)}(hhh]h)}(hNameh]hName}(hj|hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhKhjyubah}(h]h ]h"]h$]h&]uh1jwhjtubjx)}(hhh]h)}(hunitsh]hunits}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhKhjubah}(h]h ]h"]h$]h&]uh1jwhjtubjx)}(hhh]h)}(h descriptionh]h description}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhKhjubah}(h]h ]h"]h$]h&]uh1jwhjtubeh}(h]h ]h"]h$]h&]uh1jrhjoubah}(h]h ]h"]h$]h&]uh1jmhjJubhtbody)}(hhh](js)}(hhh](jx)}(hhh]h)}(h read I/Osh]h read I/Os}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhKhjubah}(h]h ]h"]h$]h&]uh1jwhjubjx)}(hhh]h)}(hrequestsh]hrequests}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhKhjubah}(h]h ]h"]h$]h&]uh1jwhjubjx)}(hhh]h)}(hnumber of read I/Os processedh]hnumber of read I/Os processed}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhKhjubah}(h]h ]h"]h$]h&]uh1jwhjubeh}(h]h ]h"]h$]h&]uh1jrhjubjs)}(hhh](jx)}(hhh]h)}(h read mergesh]h read merges}(hj#hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhKhj ubah}(h]h ]h"]h$]h&]uh1jwhjubjx)}(hhh]h)}(hrequestsh]hrequests}(hj:hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhKhj7ubah}(h]h ]h"]h$]h&]uh1jwhjubjx)}(hhh]h)}(h,number of read I/Os merged with in-queue I/Oh]h,number of read I/Os merged with in-queue I/O}(hjQhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhKhjNubah}(h]h ]h"]h$]h&]uh1jwhjubeh}(h]h ]h"]h$]h&]uh1jrhjubjs)}(hhh](jx)}(hhh]h)}(h read sectorsh]h read sectors}(hjqhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhKhjnubah}(h]h ]h"]h$]h&]uh1jwhjkubjx)}(hhh]h)}(hsectorsh]hsectors}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhKhjubah}(h]h ]h"]h$]h&]uh1jwhjkubjx)}(hhh]h)}(hnumber of sectors readh]hnumber of sectors read}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhKhjubah}(h]h ]h"]h$]h&]uh1jwhjkubeh}(h]h ]h"]h$]h&]uh1jrhjubjs)}(hhh](jx)}(hhh]h)}(h read ticksh]h read ticks}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhK hjubah}(h]h ]h"]h$]h&]uh1jwhjubjx)}(hhh]h)}(h millisecondsh]h milliseconds}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhK hjubah}(h]h ]h"]h$]h&]uh1jwhjubjx)}(hhh]h)}(h!total wait time for read requestsh]h!total wait time for read requests}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhK hjubah}(h]h ]h"]h$]h&]uh1jwhjubeh}(h]h ]h"]h$]h&]uh1jrhjubjs)}(hhh](jx)}(hhh]h)}(h write I/Osh]h write I/Os}(hj hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhK!hj ubah}(h]h ]h"]h$]h&]uh1jwhjubjx)}(hhh]h)}(hrequestsh]hrequests}(hj$hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhK!hj!ubah}(h]h ]h"]h$]h&]uh1jwhjubjx)}(hhh]h)}(hnumber of write I/Os processedh]hnumber of write I/Os processed}(hj;hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhK!hj8ubah}(h]h ]h"]h$]h&]uh1jwhjubeh}(h]h ]h"]h$]h&]uh1jrhjubjs)}(hhh](jx)}(hhh]h)}(h write mergesh]h write merges}(hj[hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhK"hjXubah}(h]h ]h"]h$]h&]uh1jwhjUubjx)}(hhh]h)}(hrequestsh]hrequests}(hjrhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhK"hjoubah}(h]h ]h"]h$]h&]uh1jwhjUubjx)}(hhh]h)}(h-number of write I/Os merged with in-queue I/Oh]h-number of write I/Os merged with in-queue I/O}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhK"hjubah}(h]h ]h"]h$]h&]uh1jwhjUubeh}(h]h ]h"]h$]h&]uh1jrhjubjs)}(hhh](jx)}(hhh]h)}(h write sectorsh]h write sectors}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhK#hjubah}(h]h ]h"]h$]h&]uh1jwhjubjx)}(hhh]h)}(hsectorsh]hsectors}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhK#hjubah}(h]h ]h"]h$]h&]uh1jwhjubjx)}(hhh]h)}(hnumber of sectors writtenh]hnumber of sectors written}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhK#hjubah}(h]h ]h"]h$]h&]uh1jwhjubeh}(h]h ]h"]h$]h&]uh1jrhjubjs)}(hhh](jx)}(hhh]h)}(h write ticksh]h write ticks}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhK$hjubah}(h]h ]h"]h$]h&]uh1jwhjubjx)}(hhh]h)}(h millisecondsh]h milliseconds}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhK$hj ubah}(h]h ]h"]h$]h&]uh1jwhjubjx)}(hhh]h)}(h"total wait time for write requestsh]h"total wait time for write requests}(hj%hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhK$hj"ubah}(h]h ]h"]h$]h&]uh1jwhjubeh}(h]h ]h"]h$]h&]uh1jrhjubjs)}(hhh](jx)}(hhh]h)}(h in_flighth]h in_flight}(hjEhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhK%hjBubah}(h]h ]h"]h$]h&]uh1jwhj?ubjx)}(hhh]h)}(hrequestsh]hrequests}(hj\hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhK%hjYubah}(h]h ]h"]h$]h&]uh1jwhj?ubjx)}(hhh]h)}(h"number of I/Os currently in flighth]h"number of I/Os currently in flight}(hjshhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhK%hjpubah}(h]h ]h"]h$]h&]uh1jwhj?ubeh}(h]h ]h"]h$]h&]uh1jrhjubjs)}(hhh](jx)}(hhh]h)}(hio_ticksh]hio_ticks}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhK&hjubah}(h]h ]h"]h$]h&]uh1jwhjubjx)}(hhh]h)}(h millisecondsh]h milliseconds}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhK&hjubah}(h]h ]h"]h$]h&]uh1jwhjubjx)}(hhh]h)}(h,total time this block device has been activeh]h,total time this block device has been active}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhK&hjubah}(h]h ]h"]h$]h&]uh1jwhjubeh}(h]h ]h"]h$]h&]uh1jrhjubjs)}(hhh](jx)}(hhh]h)}(h time_in_queueh]h time_in_queue}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhK'hjubah}(h]h ]h"]h$]h&]uh1jwhjubjx)}(hhh]h)}(h millisecondsh]h milliseconds}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhK'hjubah}(h]h ]h"]h$]h&]uh1jwhjubjx)}(hhh]h)}(h total wait time for all requestsh]h total wait time for all requests}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhK'hj ubah}(h]h ]h"]h$]h&]uh1jwhjubeh}(h]h ]h"]h$]h&]uh1jrhjubjs)}(hhh](jx)}(hhh]h)}(h discard I/Osh]h discard I/Os}(hj/hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhK(hj,ubah}(h]h ]h"]h$]h&]uh1jwhj)ubjx)}(hhh]h)}(hrequestsh]hrequests}(hjFhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhK(hjCubah}(h]h ]h"]h$]h&]uh1jwhj)ubjx)}(hhh]h)}(h number of discard I/Os processedh]h number of discard I/Os processed}(hj]hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhK(hjZubah}(h]h ]h"]h$]h&]uh1jwhj)ubeh}(h]h ]h"]h$]h&]uh1jrhjubjs)}(hhh](jx)}(hhh]h)}(hdiscard mergesh]hdiscard merges}(hj}hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhK)hjzubah}(h]h ]h"]h$]h&]uh1jwhjwubjx)}(hhh]h)}(hrequestsh]hrequests}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhK)hjubah}(h]h ]h"]h$]h&]uh1jwhjwubjx)}(hhh]h)}(h/number of discard I/Os merged with in-queue I/Oh]h/number of discard I/Os merged with in-queue I/O}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhK)hjubah}(h]h ]h"]h$]h&]uh1jwhjwubeh}(h]h ]h"]h$]h&]uh1jrhjubjs)}(hhh](jx)}(hhh]h)}(hdiscard sectorsh]hdiscard sectors}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhK*hjubah}(h]h ]h"]h$]h&]uh1jwhjubjx)}(hhh]h)}(hsectorsh]hsectors}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhK*hjubah}(h]h ]h"]h$]h&]uh1jwhjubjx)}(hhh]h)}(hnumber of sectors discardedh]hnumber of sectors discarded}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhK*hjubah}(h]h ]h"]h$]h&]uh1jwhjubeh}(h]h ]h"]h$]h&]uh1jrhjubjs)}(hhh](jx)}(hhh]h)}(h discard ticksh]h discard ticks}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhK+hjubah}(h]h ]h"]h$]h&]uh1jwhjubjx)}(hhh]h)}(h millisecondsh]h milliseconds}(hj0hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhK+hj-ubah}(h]h ]h"]h$]h&]uh1jwhjubjx)}(hhh]h)}(h$total wait time for discard requestsh]h$total wait time for discard requests}(hjGhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhK+hjDubah}(h]h ]h"]h$]h&]uh1jwhjubeh}(h]h ]h"]h$]h&]uh1jrhjubjs)}(hhh](jx)}(hhh]h)}(h flush I/Osh]h flush I/Os}(hjghhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhK,hjdubah}(h]h ]h"]h$]h&]uh1jwhjaubjx)}(hhh]h)}(hrequestsh]hrequests}(hj~hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhK,hj{ubah}(h]h ]h"]h$]h&]uh1jwhjaubjx)}(hhh]h)}(hnumber of flush I/Os processedh]hnumber of flush I/Os processed}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhK,hjubah}(h]h ]h"]h$]h&]uh1jwhjaubeh}(h]h ]h"]h$]h&]uh1jrhjubjs)}(hhh](jx)}(hhh]h)}(h flush ticksh]h flush ticks}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhK-hjubah}(h]h ]h"]h$]h&]uh1jwhjubjx)}(hhh]h)}(h millisecondsh]h milliseconds}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhK-hjubah}(h]h ]h"]h$]h&]uh1jwhjubjx)}(hhh]h)}(h"total wait time for flush requestsh]h"total wait time for flush requests}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhK-hjubah}(h]h ]h"]h$]h&]uh1jwhjubeh}(h]h ]h"]h$]h&]uh1jrhjubeh}(h]h ]h"]h$]h&]uh1jhjJubeh}(h]h ]h"]h$]h&]colsKuh1jHhjEubah}(h]h ]h"]h$]h&]uh1jChhhhhhhNubh)}(hhh](h)}(h#read I/Os, write I/Os, discard I/0sh]h#read I/Os, write I/Os, discard I/0s}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhjhhhhhK1ubh)}(h5These values increment when an I/O request completes.h]h5These values increment when an I/O request completes.}(hj!hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhK3hjhhubeh}(h]!read-i-os-write-i-os-discard-i-0sah ]h"]#read i/os, write i/os, discard i/0sah$]h&]uh1hhhhhhhhK1ubh)}(hhh](h)}(h flush I/Osh]h flush I/Os}(hj:hhhNhNubah}(h]h ]h"]h$]h&]uh1hhj7hhhhhK6ubh)}(h;These values increment when an flush I/O request completes.h]h;These values increment when an flush I/O request completes.}(hjHhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhK8hj7hhubh)}(hBlock layer combines flush requests and executes at most one at a time. This counts flush requests executed by disk. Not tracked for partitions.h]hBlock layer combines flush requests and executes at most one at a time. This counts flush requests executed by disk. Not tracked for partitions.}(hjVhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhK:hj7hhubeh}(h] flush-i-osah ]h"] flush i/osah$]h&]uh1hhhhhhhhK6ubh)}(hhh](h)}(h)read merges, write merges, discard mergesh]h)read merges, write merges, discard merges}(hjohhhNhNubah}(h]h ]h"]h$]h&]uh1hhjlhhhhhK>ubh)}(hXThese values increment when an I/O request is merged with an already-queued I/O request.h]hXThese values increment when an I/O request is merged with an already-queued I/O request.}(hj}hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhK@hjlhhubeh}(h]'read-merges-write-merges-discard-mergesah ]h"])read merges, write merges, discard mergesah$]h&]uh1hhhhhhhhK>ubh)}(hhh](h)}(h,read sectors, write sectors, discard_sectorsh]h,read sectors, write sectors, discard_sectors}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhjhhhhhKDubh)}(hXThese values count the number of sectors read from, written to, or discarded from this block device. The "sectors" in question are the standard UNIX 512-byte sectors, not any device- or filesystem-specific block size. The counters are incremented when the I/O completes.h]hXThese values count the number of sectors read from, written to, or discarded from this block device. The “sectors” in question are the standard UNIX 512-byte sectors, not any device- or filesystem-specific block size. The counters are incremented when the I/O completes.}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhKFhjhhubeh}(h]*read-sectors-write-sectors-discard-sectorsah ]h"],read sectors, write sectors, discard_sectorsah$]h&]uh1hhhhhhhhKDubh)}(hhh](h)}(h3read ticks, write ticks, discard ticks, flush ticksh]h3read ticks, write ticks, discard ticks, flush ticks}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhjhhhhhKLubh)}(hX@These values count the number of milliseconds that I/O requests have waited on this block device. If there are multiple I/O requests waiting, these values will increase at a rate greater than 1000/second; for example, if 60 read requests wait for an average of 30 ms, the read_ticks field will increase by 60*30 = 1800.h]hX@These values count the number of milliseconds that I/O requests have waited on this block device. If there are multiple I/O requests waiting, these values will increase at a rate greater than 1000/second; for example, if 60 read requests wait for an average of 30 ms, the read_ticks field will increase by 60*30 = 1800.}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhKNhjhhubeh}(h]0read-ticks-write-ticks-discard-ticks-flush-ticksah ]h"]3read ticks, write ticks, discard ticks, flush ticksah$]h&]uh1hhhhhhhhKLubh)}(hhh](h)}(h in_flighth]h in_flight}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhjhhhhhKUubh)}(hThis value counts the number of I/O requests that have been issued to the device driver but have not yet completed. It does not include I/O requests that are in the queue but not yet issued to the device driver.h]hThis value counts the number of I/O requests that have been issued to the device driver but have not yet completed. It does not include I/O requests that are in the queue but not yet issued to the device driver.}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhKWhjhhubeh}(h] in-flightah ]h"] in_flightah$]h&]uh1hhhhhhhhKUubh)}(hhh](h)}(hio_ticksh]hio_ticks}(hj hhhNhNubah}(h]h ]h"]h$]h&]uh1hhjhhhhhK\ubh)}(haThis value counts the number of milliseconds during which the device has had I/O requests queued.h]haThis value counts the number of milliseconds during which the device has had I/O requests queued.}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhK^hjhhubeh}(h]io-ticksah ]h"]io_ticksah$]h&]uh1hhhhhhhhK\ubh)}(hhh](h)}(h time_in_queueh]h time_in_queue}(hj2hhhNhNubah}(h]h ]h"]h$]h&]uh1hhj/hhhhhKbubh)}(hX!This value counts the number of milliseconds that I/O requests have waited on this block device. If there are multiple I/O requests waiting, this value will increase as the product of the number of milliseconds times the number of requests waiting (see "read ticks" above for an example).h]hX%This value counts the number of milliseconds that I/O requests have waited on this block device. 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