IOSTAT(1-BSD)       RISC/os Reference Manual        IOSTAT(1-BSD)



NAME
     iostat - report I/O statistics

SYNOPSIS
     iostat [ drives ] [ interval [ count ] ]

DESCRIPTION
     iostat iteratively reports the number of characters read and
     written to terminals per second, and, for each disk, the
     number of transfers per second, kilobytes transferred per
     second, and the estimated milliseconds per average seek.  It
     also gives the percentage of time the system has spent in
     user mode, in user mode running low priority (niced)
     processes, in system mode, and idling.

     To compute this information, for each disk, seeks and data
     transfer completions and number of words transferred are
     counted; for terminals collectively, the number of input and
     output characters are counted.

     The optional interval argument causes iostat to report once
     each interval seconds.  The first report is for  all time
     since a reboot and each subsequent report is for the last
     interval only.

     The optional count argument restricts the number of reports.

     If more than 4 disk drives are configured in the system,
     iostat displays only the first 4 drives.  To force iostat to
     display specific drives, their names may be supplied on the
     command line.

FILES
     /dev/kmem
     /unix

SEE ALSO
     vmstat(1)

















                         Printed 1/15/91                   Page 1