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Annotation of 43BSDReno/usr.sbin/iostat/iostat.8, revision 1.1

1.1     ! root        1: .\" Copyright (c) 1980 Regents of the University of California.
        !             2: .\" All rights reserved.  The Berkeley software License Agreement
        !             3: .\" specifies the terms and conditions for redistribution.
        !             4: .\"
        !             5: .\"    @(#)iostat.8    6.2 (Berkeley) 6/22/90
        !             6: .\"
        !             7: .TH IOSTAT 8 "June 22, 1990"
        !             8: .UC 4
        !             9: .SH NAME
        !            10: iostat \- report I/O statistics
        !            11: .SH SYNOPSIS
        !            12: .B iostat
        !            13: [ drives ]
        !            14: [ interval [ count ] ]
        !            15: .SH DESCRIPTION
        !            16: .I Iostat
        !            17: iteratively reports the number of characters read and written to terminals
        !            18: per second,
        !            19: and, for each disk, the number of transfers per second, kilobytes
        !            20: transferred per second,
        !            21: and the milliseconds per average seek.
        !            22: It also gives the percentage of time the system has
        !            23: spent in user mode, in user mode running low priority (niced) processes,
        !            24: in system mode, and idling.
        !            25: .PP
        !            26: To compute this information, for each disk, seeks and data transfer completions
        !            27: and number of words transferred are counted;
        !            28: for terminals collectively, the number
        !            29: of input and output characters are counted.
        !            30: Also, each sixtieth of a second,
        !            31: the state of each disk is examined
        !            32: and a tally is made if the disk is active.
        !            33: From these numbers and given the transfer rates
        !            34: of the devices it is possible to determine
        !            35: average seek times for each device.
        !            36: .PP
        !            37: The optional
        !            38: .I interval
        !            39: argument causes
        !            40: .I iostat
        !            41: to report once each
        !            42: .I interval
        !            43: seconds.
        !            44: The first report is for  all time since a reboot and each
        !            45: subsequent report is for the last interval only.
        !            46: .PP
        !            47: The optional
        !            48: .I count
        !            49: argument restricts the number of reports.
        !            50: .PP
        !            51: If more than 4 disk drives are configured in the system,
        !            52: .I iostat
        !            53: displays only the first 4 drives, with priority given
        !            54: to Massbus disk drives (i.e. if both Unibus and Massbus
        !            55: drives are present and the total number of drives exceeds
        !            56: 4, then some number of Unibus drives will not be displayed
        !            57: in favor of the Massbus drives).  To force
        !            58: .I iostat
        !            59: to display specific drives, their names may be supplied on
        !            60: the command line.
        !            61: .SH FILES
        !            62: /dev/kmem
        !            63: .br
        !            64: /vmunix
        !            65: .SH SEE ALSO
        !            66: vmstat(1)

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