IOSTAT(1) — HP-UX

Series 300, 800 Only

NAME

iostat − report I/O statistics

SYNOPSIS

iostat [ -t] [ interval [ count ] ]

DESCRIPTION

Iostat iteratively reports for each disk the number of seeks per second, kilobytes transfered per second, and the milliseconds per average seek. If given a -t argument, it also reports the number of characters read from and written to terminals, and 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. Also, the state of each disk is examined HZ times per second (as found in <sys/param.h>) and a tally is made if the disk is active. From these numbers and given the transfer rates of the devices it is possible to determine average seek times for each device.

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

The optional count argument restricts the number of reports.

AUTHOR

Iostat was developed by the University of California, Berkeley California, Computer Science Division, Department of Electrical Engineering and Computer Science.

FILES

/dev/kmem
/hp-ux

Museum