iostat man page on OpenBSD

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IOSTAT(8)		OpenBSD System Manager's Manual		     IOSTAT(8)

NAME
     iostat - report I/O statistics

SYNOPSIS
     iostat [-CDdIT] [-c count] [-M core] [-N system] [-w wait] [drives]

DESCRIPTION
     iostat displays kernel I/O statistics on terminal, disk and CPU
     operations.  By default, iostat displays one line of statistics averaged
     over the machine's run time.  The -I option causes iostat to print raw,
     unaveraged values.

     The options are as follows:

     -C	     Show CPU statistics.  This is enabled by default unless the -D,
	     -d, or -T flags are used.

     -c count
	     Repeat the display count times.  Unless the -I flag is in effect,
	     the first display is for the time since a reboot and each
	     subsequent report is for the time period since the last display.
	     Unless overridden by the -w option, the wait interval between
	     lines is 1 second.

     -D	     Show alternate disk statistics.  Displays kilobytes transferred,
	     number of transfers, and time spent in transfers.	Use of this
	     flag disables the default display.

     -d	     Show disk statistics.  This is the default.  Displays kilobytes
	     per transfer, number of transfers, and megabytes transferred.
	     Use of this flag disables display of CPU and tty statistics.

     -I	     Show the running total values, rather than an average.

     -M core
	     Extract values associated with the name list from the specified
	     core instead of the default /dev/mem.

     -N system
	     Extract the name list from the specified system instead of the
	     default ``/bsd''.

     -T	     Show tty statistics.  This is enabled by default unless the -C,
	     -D, or -d flags are used.

     -w wait
	     Pause wait seconds between each display.  Unless a count is
	     specified via the -c option, iostat will display output until it
	     is interrupted.

     iostat displays its information in the following format:

     tty
	   tin	   characters read from terminals
	   tout	   characters written to terminals

     disks
	   Disk operations.  The header of the field is the disk name and unit
	   number.  If more than four disk drives are configured in the
	   system, iostat displays only the first four drives.	To force
	   iostat to display specific drives, their names may be supplied on
	   the command line.

	   KB/t	   Kilobytes transferred per disk transfer
	   t/s	   Transfers per second
	   MB/s	   Megabytes transferred per second

	   The alternate display format, (selected with -D), presents the
	   following values:

	   KB	   Kilobytes transferred
	   xfr	   Disk transfers
	   time	   Seconds spent in disk activity

     cpu
	   us	   % of CPU time in user mode
	   ni	   % of CPU time in user mode running niced processes
	   sy	   % of CPU time in system mode
	   in	   % of CPU time processing interrupts
	   id	   % of CPU time in idle mode

FILES
     /bsd      default kernel namelist
     /dev/mem  default memory file

SEE ALSO
     fstat(1), netstat(1), nfsstat(1), ps(1), systat(1), top(1), pstat(8),
     vmstat(8)

     The sections starting with ``Interpreting system activity'' in Installing
     and Operating 4.3BSD.

OpenBSD 4.9		       February 10, 2011		   OpenBSD 4.9
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