dkstat man page on IRIX

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DKSTAT(1)							     DKSTAT(1)

NAME
     dkstat - report disk I/O statistics

SYNOPSIS
     dkstat [-h host] [-L] [-f {r|t|s}] [-r] [-w] [-n ndisks] [-c] [-a] [-i
     devspec[,devspec ...]]  [-x devspec[,devspec ...]]	 [interval [repeat]]

TYPICAL USAGE
     To monitor I/O rates on all disks every 5 seconds

	       dkstat

     To continuously display a table of disks on the host "babylon", use the
     following command;

	       dkstat -c -ft -h babylon

DESCRIPTION
     dkstat reports physical disk I/O statistics.  The default report shows
     the average physical I/O rate (requests per second, or IOPS) to each disk
     during the sample interval (default 5 seconds).

     The options to dkstat are as follows;

     -?	  Output usage information.

     -h host
	  Report for the host host, which must be running pmcd(1).  The
	  default is to report for the local host.

     -L	  Report for the local host and by-pass pmcd(1).  This option is
	  mutually exclusive with the -h option and is the default if pmcd(1)
	  is not running.  In either case root privileges are required to by-
	  pass pmcd(1) and retrieve the desired metrics directly.

     -c	  Invokes continuous mode, using a curses(3) display. This is most
	  useful with the "sorted" (-fs) and "table" (-ft) display formats.

     -f {r|t|s}
	  Selects the report format as follows:

	  -fr  selects ``row'' format (one column per drive).  The report is
	       sorted on drive name across the page.  This is the default
	       display format.

	  -ft  selects ``table'' format (one line per controller).  The report
	       is sorted on controller name down the page and by drive unit
	       number across the page.
	       For SCSI devices with non-zero Logical Unit Numbers (LUNs) all
	       devices for a single SCSI target address appear in a the same
	       row, sorted by LUN.  Down the page, rows are sorted by SCSI
	       target within controller.

									Page 1

DKSTAT(1)							     DKSTAT(1)

	  -fs  selects ``sorted'' format (one drive per line).	The report is
	       sorted for the most active drive, depending on the -r and -w
	       flags.  If neither -r or -w are given, the report is sorted on
	       total number of I/Os (reads plus writes).  The -n option
	       restricts the report to the ndisks most active disks (default
	       22).  The %Busy column in the output is the percentage of time
	       during the interval that the drive was active.  The MeanST
	       column in the output is the average service time of all
	       requests which completed during the interval (in units of
	       milliseconds).

     -r	  Only report reads from each drive.  The default is to sum reads and
	  writes.  The -fs style report will be sorted for the drives which
	  perform the most read I/Os per second.

     -w	  Only report writes to each drive.  The -fs style report will be
	  sorted for the drives which perform the most write I/Os per second.

     -rw  Report both reads and writes to each drive.  If neither -r or -w are
	  given, then report total I/Os (reads plus writes).

     interval [repeats]
	  Specifies the interval in seconds between successive reports
	  (default 5 seconds) and the number of intervals to report (default
	  is to repeat forever).  All statistics are averaged over the
	  interval.

DEVICE SELECTION
     The -a flag (default) causes all drives and controllers to be reported
     (depending on the report format).	This may be modified by the -i option
     to include only some drives and exclude all others, or by the -x option
     to exclude some drives and include all others.

     The argument to the -i or -x option is a comma separated list (without
     spaces before or after each comma) of device specifiers (devspec).	 A
     devspec is a string of characters that might reasonably be expected to be
     the prefix for the names (as report via -I) of one or more devices.

     Examples;

     dks1d6l3	    SCSI controller 1, target 6, LUN 3.

     dks0d1	    SCSI controller 0, target 1, all LUNs.

     dks4	    All drives on SCSI controller 4.

     dks6,dks0d3    All drives on SCSI controller 6 and SCSI target 3 on SCSI
		    controller 0.

									Page 2

DKSTAT(1)							     DKSTAT(1)

SEE ALSO
     pmcd(1), sar(1), sadc(1), gr_top(1), osview(1) and gr_osview(1).

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