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Annotation of cci/usr/src/man/man1/iostat.1, revision 1.1.1.1

1.1       root        1: .TH IOSTAT 1 "18 January 1983"
                      2: .UC 4
                      3: .SH NAME
                      4: iostat \- report I/O statistics
                      5: .SH SYNOPSIS
                      6: .B iostat
                      7: [ interval [ count ] ]
                      8: .SH DESCRIPTION
                      9: .I Iostat
                     10: iteratively reports the number of characters read and written to terminals,
                     11: and, for each disk, the number of seeks transfers per second, kilobytes
                     12: transfered per second,
                     13: and the milliseconds per average seek.
                     14: It also gives the percentage of time the system has
                     15: spent in user mode, in user mode running low priority (niced) processes,
                     16: in system mode, and idling.
                     17: .PP
                     18: To compute this information, for each disk, seeks and data transfer completions
                     19: and number of words transferred are counted;
                     20: for terminals collectively, the number
                     21: of input and output characters are counted.
                     22: Also, each sixtieth of a second,
                     23: the state of each disk is examined
                     24: and a tally is made if the disk is active.
                     25: From these numbers and given the transfer rates
                     26: of the devices it is possible to determine
                     27: average seek times for each device.
                     28: .PP
                     29: The optional
                     30: .I interval
                     31: argument causes
                     32: .I iostat
                     33: to report once each
                     34: .I interval
                     35: seconds.
                     36: The first report is for  all time since a reboot and each
                     37: subsequent report is for the last interval only.
                     38: .PP
                     39: The optional
                     40: .I count
                     41: argument restricts the number of reports.
                     42: .SH FILES
                     43: /dev/kmem
                     44: .br
                     45: /vmunix
                     46: .SH SEE ALSO
                     47: vmstat(1)

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