command: iostat
purpose: Reports Central Processing Unit (CPU) statistics, asynchronous
input/output (AIO and input/output statistics for the
entire system,
adapters, TTY devices, disks and CD-ROMs.
syntax: iostat [ -c ] [ -d ] [ -h ] [ -N ] [ -k | -m ] [ -t ] [ -V ] [
-x ] [-z ] [ device [...] | ALL ]
[ -p [ device [,...] | ALL ] ] [ interval [count ] ]
options: -c Display the CPU utilization report.
-d Display the device utilization report.
-h Make the Device Utilization Report easier to read by a
human.
-k Display statistics in kilobytes per second.
-m Display statistics in megabytes per second.
-N Display the registered device mapper names for any
device mapper devices.
Useful for viewing LVM2 statistics.
-p [ { device [,...] | ALL } The -p option displays
statistics for block devices and all
their partitions that are used by the system.
-t Print the time for each report displayed. The
timestamp format
may depend on the value of the S_TIME_FORMAT
environment variable
-V Print version number then exit.
-x Display extended statistics.
-z Tell iostat to omit output for any devices for which
there was
no activity during the sample period.
examples:
1. To display a single history since boot report for all
TTY, CPU, and Disks, type:
#iostat
2. To display a continuous disk report at two second
intervals for the disk with the logical name disk1,
type:
#iostat -d disk1 2
3. To display six reports at two second intervals for the
disk with the logical name disk1, type:
#iostat disk1 2 6
4. To display six reports at two second intervals for all
disks, type:
#iostat -d 2 6
5. To display six reports at two second intervals for
three disks named disk1, disk2, disk3, type:
#iostat disk1 disk2 disk3 2 6
6. To print the System throughput report since boot, type:
#iostat -s
7. To print the Adapter throughput reports at 5-second
intervals, type:
#iostat -a 5
8. To print 10 System and Adapter throughput reports at
20-second intervals, with only the TTY and
CPU report (no disk reports), type:
#iostat -sat 20 10
9. To display time stamp next to each line of output of
iostat, type:
#iostat -T 60
10. To display 6 reports at 2-second intervals on AIO, type:
#iostat -A 2 6
11. To display AIO statistics since boot for queues
associated with all mounted filesystems, type:
#iostat -A -Q
12. To display extended drive report for all disks, type:
#iostat -D
file: /usr/bin/iostat Contains the iostat command.
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