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:
iostat
iostat -x
, includes among other information%util
column.sar -d
also display%util
information.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]
hdparm
nice
andionice
- Performance: IO performance:
iotop, iostat, sar -d, fio, nmon, vmstat -d
,dd
,nmon
,stress
- Performance: sysstat,
sar
,sadc
,debian-sa1
,sa1, sa2
,iostat
,nfsiostat
mpstat
,changelog
,/usr/lib/sysstat/sadc
,/etc/sysstat/sysstat
,pidstat, irqstat
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