iostat man page on Ultrix

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iostat(1)							     iostat(1)

       iostat - report I/O statistics

       iostat [ -c ] [ -t ] [ disknames ] [ interval ] [ count ]

       The  command reports I/O statistics for terminals, disks and cpus.  For
       terminals the number of input and output characters are	counted.   For
       disks  the number of 512 byte blocks per second and number of transfers
       per second are displayed.  For cpus, it provides the percentage of time
       the  system  has	 spent in user mode, in user mode running low priority
       (niced) processes, in system mode, and idling.  On multiprocessor  sys‐
       tems  these  cpu	 statistics  represent a cumulative summary of all the

       The optional disknames argument causes disk statistics to be  displayed
       for  the	 specified disks.  If this argument is not specified then disk
       statistics will be displayed for the first 3 disks only.

       The optional interval argument causes to report once each interval sec‐
       onds.   The first report is for all time since a reboot and each subse‐
       quent report is for the last interval only.

       The optional count argument restricts the number of reports.

       -c   Displays the percentage of time each cpu spent in user mode,  run‐
	    ning low priority (nice'd) processes, in system mode, and idling.

       -t   Displays  the number of characters read from and written to termi‐

       This example will cause cpu and disk statistics for the	5  disks  ra0,
       ra1, ra2, ra3, and ra4.
	    iostat ra0 ra1 ra2 ra3 ra4
       This  example  will cause cpu, terminal, and disk statistics for ra0 to
       be displayed and updated every 2 seconds.
	    iostat -t ra0 2

See Also
       vmstat(1), cpustat(1)


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