Iostat
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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 -xc
-c Display the CPU utilization report
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
See also
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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