Sun Microsystems Sun Workstation 100U System Manager's Manual page 200

IOSTAT(8)
MAINTENANCE COMMANDS
IOSTAT(8)
NAME
iostat - report I/O statistics
SYNOPSIS
loatat ( interval ( count J J
DESCRIPTION
FILES
loetal iteratively reports the number or characters read and written to terminals, and, ror each
d.,k, the number or seeks and transrers per second, and the milliseconds per average seek. It also
gives the percentage or time the system has spent in user mode, in user mode running low priority
(~:~~ed)
processes, in system mode, and idling.
TQ compute this inrormation, (or each disk, seeks and data transrer completions and number o(
wijrds transferred are eounted; (or terminals collectively, the number o( input and output charac-
teJ18 are counted. Also, each sixtieth o( a second, the state or each disk is examined and a tally is
made ir the disk is active. From these numbers and given the transrer rates o( the devices it is
possible to determine average seek times ror each device.
The optional interval argument causes iostat
to
report once each interval seconds. The first report
is (or all time since a reboot and each subsequent report is (or the last interval only.
The optional count argument restricts the number or reports.
/dev/kmem
/vmunix
SEE ALSO
vmstat(8)
Sun ReleaE.. 1.1
Last change: 1 September 1983
45