iostat man page on DigitalUNIX

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iostat(1)							     iostat(1)

       iostat - Reports I/O statistics

       iostat [drive...] [interval] [count]

       Forces  iostat  to  display specific drives.  If drive is not specified
       (or the specified drive does not exist on the system or cluster, iostat
       displays	 the  first  two drives (even if more than two disk drives are
       configured in the system).  Causes iostat to report once each  interval
       seconds.	  The  first  report is for all time since the system was last
       booted, and each subsequent report is for the  last  interval  only.The
       value  must  not	 be 0.	Specifies the number of reports.  For example,
       iostat 1 10 would produce 10 reports at 1-second intervals.  You cannot
       specify	count  without	interval because the first numeric argument to
       iostat is assumed to be interval.

       The iostat command reports the  following  information:	For  terminals
       (collectively),	the  number of characters read and written per second.
       For each disk, the number of transfers per second and bytes transferred
       per  second (in kilobytes).  For the system, the percentage of time the
       system has spent in user mode, in user mode running low priority (nice)
       processes, in system mode, and idling.

       To  compute  this information, iostat counts data transfer completions,
       the number of words transferred for each disk, and the collective  num‐
       ber  of	input and output characters for terminals. Also, each sixtieth
       of a second, iostat examines the state of each disk and makes  a	 tally
       if the disk is active.

       When  you issue an iostat command on a cluster member, it displays sta‐
       tistics only for those disks that are local to the member and that mem‐
       ber's  usage of those shared disks that it has mounted.	 It displays 0
       for other disks in the cluster (those it doesn't have mounted), regard‐
       less  of	 whether they are on the shared bus or are local to some other

       The output from this example displays cpu, terminal, and	 disk  statis‐
       tics  for  the  first  two disks on the system providing 5 reports at 1
       second intervals:

       # iostat 1 5
	   tty	    floppy1	     dsk9	   cpu
	tin tout    bps	   tps	  bps	 tps  us ni sy id
	  0    3      0	     0	    0	   0   1  0  4 95
	  4   58      0	     0	    0	   0   1  0  2 97
	  1   53      0	     0	    0	   0   0  0  2 98
	  5   59      0	     0	    0	   0   1  0  1 98
	  6   60      0	     0	    0	   0   1  0  2 97

       The second example specifies device names in the command:

       # iostat dsk2 dsk3 cdrom2
	      tty	dsk2	cdrom2	     dsk3	  cpu
	tin   tout  bps	 tps  bps  tps	 bps  tps  us  ni  sy  id
	  0    13    11	  5    5    2	2427 1213   0	1   1  98



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