Wednesday, April 17, 2013

Linux : iostat - storage performance

iostat - Report Central Processing Unit (CPU) statistics and input/output statistics for devices and partitions.

To see the statistics of your disk and partitions run the following iostat command:

# iostat -mx -h -p /dev/sdb 3

-m    Display statistics in megabytes per second
-x     Display extended statistics
-h     Make the Device Utilization Report easier to read by a human
-p     Displays statistics for block devices and all their partitions
        that are used by the system
/dev/sdb - disk to be tested
3       The interval parameter specifies the amount of time in seconds between each report.

Example for two disks, sda and sdb including partitions:

# iostat -mx -h -d -p /dev/sda -p /dev/sdb 3

# whereis iostat
iostat: /bin/iostat /usr/bin/iostat /usr/share/man/man1/iostat.1.gz

Man page:
# man 1 iostat