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IOSTAT(1)							     IOSTAT(1)

NAME
       iostat - report I/O statistics

SYNOPSIS
       iostat [ drives ] [ interval [ count ] ]

DESCRIPTION
       Iostat iteratively reports the number of characters read and written to
       terminals per second, and, for each disk, the number of	transfers  per
       second,	kilobytes  transferred	per  second,  and the milliseconds per
       average seek.  It also gives the percentage  of	time  the  system  has
       spent  in  user	mode,  in  user	 mode  running	low  priority  (niced)
       processes, in system mode, and idling.

       To compute this information, for each disk,  seeks  and	data  transfer
       completions  and number of words transferred are counted; for terminals
       collectively, the number of input and output  characters	 are  counted.
       Also, each sixtieth of a second, the state of each disk is examined and
       a tally is made if the disk is active.  From these  numbers  and	 given
       the  transfer  rates of the devices it is possible to determine average
       seek times for each device.

       The optional interval  argument	causes	iostat	to  report  once  each
       interval	 seconds.  The first report is for all time since a reboot and
       each subsequent report is for the last interval only.

       The optional count argument restricts the number of reports.

       If more than 4  disk  drives  are  configured  in  the  system,	iostat
       displays	 only the first 4 drives.  To force iostat to display specific
       drives, their names may be supplied on the command line.

FILES
       /dev/kmem
       /mach

SEE ALSO
       vm_stat(1)

4th Berkeley Distribution	April 29, 1985			     IOSTAT(1)

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