Support > iostat

Article:HOWTO101293  |  Created: 2014-07-28  |  Updated: 2014-07-28  |  Article URL http://www.symantec.com/docs/HOWTO101293
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How To

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Main > Support > iostat — Used to monitor system input and output device loading

SYNOPSIS

iostat [options] [interval] [count]

Description

The iostat command is a Linux command that you can use to monitor system input and output devices. The command enables you to observe the time that the devices are active in relation to their average transfer rates. This command generates reports that you can use to change the system configuration to better balance the input and the output load between physical disks. The iostat command generates reports continuously.

OPTIONS

iostat

Used to monitor system input and output device loading.

[options]

The following list describes the available options that are supported:

  • -c

    Display the CPU utilization report.

  • -d

    Display the device utilization report.

  • -N

    Display the registered device mapper names for any device mapper devices.

  • -n

    Display the network file system (NFS) report. This option works only with kernel 2.6.17 and later.

  • -h

    Make the NFS report that is displayed by option -n easier to read.

  • -k

    Display statistics in kilobytes per second instead of blocks per second.

  • -m

    Display statistics in megabytes per second instead of blocks or kilobytes per second.

  • -t

    Print the time for each report displayed.

  • -V

    Print the version number then exit.

  • -x

    Display the extended statistics.

  • -p [ { device [,...] | ALL } ]

    The -p option displays the statistics for block devices and all their partitions that the system uses. If a device name is entered on the command line, then the statistics for it and all of its partitions are displayed. The ALL keyword indicates that statistics have to be displayed for all the block devices and partitions defined by the system. That includes those that have never been used.

  • [device [,...] | ALL]

    If a device name is entered on the command line, then the statistics for it and all of its partitions are displayed. The ALL keyword indicates that statistics have to be displayed for all the block devices and partitions defined by the system. That includes those that have never been used.

[interval]
  • The interval parameter specifies the amount of time in seconds between each report.

  • The first report contains statistics for the time since system startup. Each subsequent report contains statistics that are collected during the interval since the previous report.

[count]
  • The count parameter can be specified with the interval parameter.

  • If the count parameter is specified, the value of count determines the number of reports that are generated at interval seconds apart.


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