iostat man page on UNIXv7

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IOSTAT(1M)							    IOSTAT(1M)

NAME
       iostat - report I/O statistics

SYNOPSIS
       iostat [ option ] ...  [ interval [ count ] ]

DESCRIPTION
       Iostat delves into the system and reports certain statistics kept about
       input-output activity.  Information is kept about up to three different
       disks  (RF,  RK,	 RP) and about typewriters.  For each disk, IO comple‐
       tions and number of words transferred are counted; for typewriters col‐
       lectively,  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.  The tally goes into one of four
       categories, depending on whether the system is executing in user	 mode,
       in  `nice'  (background)	 user mode, in system mode, or idle.  From all
       these numbers and from the known transfer rates of the  devices	it  is
       possible	 to determine information such as the degree of IO overlap and
       average seek times for each device.

       The optional interval argument causes iostat to report once each inter‐
       val 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.

       With no option argument iostat reports for  each	 disk  the  number  of
       transfers  per  minute, the milliseconds per average seek, and the mil‐
       liseconds per data transfer exclusive of seek time.  It also gives  the
       percentage  of time the system has spend in each of the four categories
       mentioned above.

       The following options are available:

       -t     Report the number of characters of terminal  IO  per  second  as
	      well.

       -i     Report  the  percentage  of time spend in each of the four cate‐
	      gories mentioned above, the percentage of	 time  each  disk  was
	      active  (seeking	or  transferring),  the percentage of time any
	      disk was active, and the percentage of time spent in `IO	wait:'
	      idle, but with a disk active.

       -s     Report  the  raw	timing	information: 32 numbers indicating the
	      percentage of time spent in each of the possible	configurations
	      of 4 system states and 8 IO states (3 disks each active or not).

       -b     Report on the usage of IO buffers.

FILES
       /dev/mem, /unix

								    IOSTAT(1M)
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