Difference between revisions of "Iostat"
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<code>[[wikipedia:iostat|iostat]]</code>(input/output statistics) is a computer system [[monitor]] tool used to collect and show operating system storage input and output statistics. | <code>[[wikipedia:iostat|iostat]]</code>(input/output statistics) is a computer system [[monitor]] tool used to collect and show operating system storage input and output statistics. | ||
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* <code>iostat</code> | * <code>iostat</code> | ||
* <code>iostat -x</code>, includes among other information <code>%util</code> column. <code>[[sar]] -d</code> also display <code>%util</code> information. | * <code>iostat -x</code>, includes among other information <code>%util</code> column. <code>[[sar]] -d</code> also display <code>%util</code> information. | ||
| + | ** <code>iostat -x 1 -m</code> | ||
* <code>iostat -xc</code> | * <code>iostat -xc</code> | ||
-c Display the CPU utilization report | -c Display the CPU utilization report | ||
| − | Example: <code>iostat -x</code> | + | * iostat: Add --compact option. |
| + | |||
| + | Example: | ||
| + | |||
| + | * <code>iostat -x</code> | ||
<pre> | <pre> | ||
Linux 4.15.0-66-generic (server_name_1) 01/06/2019 _x86_64_ (12 CPU) | Linux 4.15.0-66-generic (server_name_1) 01/06/2019 _x86_64_ (12 CPU) | ||
| Line 27: | Line 33: | ||
dm-0 110.19 301.03 19451.00 28437.01 0.00 0.00 0.00 0.00 1.88 7.24 2.39 176.52 94.47 0.44 18.29 | dm-0 110.19 301.03 19451.00 28437.01 0.00 0.00 0.00 0.00 1.88 7.24 2.39 176.52 94.47 0.44 18.29 | ||
</pre> | </pre> | ||
| + | |||
| + | %rrqm The percentage of read requests merged together before being sent to the device. | ||
| + | |||
| + | == Related commands == | ||
| + | * <code>[[iotop]]</code> | ||
| + | * <code>[[nfsiostat]]</code> | ||
| + | * [[Device mapper]] | ||
==See also== | ==See also== | ||
Latest revision as of 09:42, 18 April 2023
iostat(input/output statistics) is a computer system monitor tool used to collect and show operating system storage input and output statistics.
Usage:
iostatiostat -x, includes among other information%utilcolumn.sar -dalso display%utilinformation.iostat -x 1 -m
iostat -xc
-c Display the CPU utilization report
- iostat: Add --compact option.
Example:
iostat -x
Linux 4.15.0-66-generic (server_name_1) 01/06/2019 _x86_64_ (12 CPU)
avg-cpu: %user %nice %system %iowait %steal %idle
26.69 0.09 5.45 2.81 0.00 64.95
Device r/s w/s rkB/s wkB/s rrqm/s wrqm/s %rrqm %wrqm r_await w_await aqu-sz rareq-sz wareq-sz svctm %util
loop0 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.03 0.00 0.00 2.49 0.00 0.00 0.00
loop1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.11 0.00 0.00 10.11 0.00 0.00 0.00
loop2 0.08 0.00 0.08 0.00 0.00 0.00 0.00 0.00 0.46 0.00 0.00 1.07 0.00 0.01 0.00
loop3 0.07 0.00 0.07 0.00 0.00 0.00 0.00 0.00 0.23 0.00 0.00 1.03 0.00 0.01 0.00
loop4 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 2.50 0.00 0.00 0.00
sda 9.24 13.63 61.04 338.74 2.22 5.29 19.36 27.97 0.22 0.37 0.01 6.61 24.85 0.09 0.20
sdb 62.13 185.19 10293.49 7751.52 0.93 0.95 1.47 0.51 1.70 17.34 3.32 165.69 41.86 0.42 10.46
sdc 46.22 203.85 9157.51 10073.27 0.91 0.57 1.94 0.28 1.59 17.32 3.60 198.14 49.42 0.44 11.11
sdd 59.95 9.98 10592.98 9774.97 0.20 3.44 0.34 25.63 1.62 173.61 1.83 176.71 979.46 1.75 12.21
dm-0 110.19 301.03 19451.00 28437.01 0.00 0.00 0.00 0.00 1.88 7.24 2.39 176.52 94.47 0.44 18.29
%rrqm The percentage of read requests merged together before being sent to the device.
Related commands[edit]
See also[edit]
hdparmniceandionice- Performance: IO performance:
iotop, iostat, sar -d, fio, nmon, vmstat -d,dd,nmon,stress - Performance: sysstat,
sar,sadc,debian-sa1,sa1, sa2,iostat,nfsiostatmpstat,changelog,/usr/lib/sysstat/sadc,/etc/sysstat/sysstat,pidstat, irqstat
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