[kanchilug] 1D1C

From: Dhana Sekar <tkdhanasekar@xxxxxxxxx>
To: ILUG-C <ilugc@xxxxxxxxxxxxx>, kanchilug@xxxxxxxxxxxxx
Date: Tue, 18 Jun 2013 10:26:42 +0530
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.
[kanchilug] 1D1C

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