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Reports on CPU and disk I/O
When run without parameters iostat produces a standard report. The following parameters can be used to modify the report:
-k Display statistics in kb/sec instead of blocks/sec.
-m Display statistics in mb/sec instead of blocks/sec.
-n Displays NFS-directory statistics.
x Display extended statistics.
The CPU statistics are displayed under the following headings:
%user CPU utilisation at the user level.
%nice CPU utilisation at the user level configured by nice.
%system CPU utilisation at the system level.
%iowait Time CPUs were idle while the system had an outstanding disk I/O request.
%steal Wait time by virtual CPUs due to hypervisor servicing other virtual processors.
%idle CPU idle time with no outstanding disk I/O requests.
Disk statistics are displayed under these headings:
tps Transfers per second.
Blk / Kb / Mb_read/s Data read in blocks / Kb / Mb per second.
Blk / Kb / Mb_wrtn/s Data written in blocks / Kb / Mb per second.
Blk / Kb / Mb_read The total number of blocks / Kb / Mb read.
Blk / Kb / Mb_wrtn The total number of blocks / Kb / Mb written.
|Diagnostic Target:||OS - Console, Ports and I/O|
|Obtain From:||Included in the sysstat tools package. Available from most package managers (eg. apt, RPM, portage)|