NAME

ctlstat — CAM Target Layer statistics utility

SYNOPSIS

ctlstat

[ -t][ -c count][ -C][ -d][ -D][ -j][ -l lun][ -n numdevs][ -w wait]

DESCRIPTION

The ctlstat utility provides statistics information for the CAM Target Layer. The first display (except for dump and JSON modes) shows average statistics since system startup. Subsequent displays show average statistics during the measurement interval.

The options are as follows:

-t

Total mode. This displays separate columns with the total CTL read and write output, and a combined total column that also includes non I/O operations.

-c count

Display statistics this many times.

-C

Disable display of CPU statistics.

-d

Display DMA operation time (latency) instead of overall I/O time (latency).

-D

Text dump mode. Dump all available statistics every 30 seconds in a text format suitable for parsing. No statistics are computed in this mode, only raw numbers are displayed.

-h

Suppress display of the header.

-j

JSON dump mode. Dump all available statistics every 30 seconds in JavaScript Object Notation (JSON) format. No statistics are computed in this mode, only raw numbers are displayed.

-l lun

Request statistics for the specified LUN. This option is incompatible with total ( -t) mode.

-n numdevs

Display statistics for this many devices.

-w wait

Wait this many seconds in between displays. If this option is not specified, ctlstat defaults to a 1 second interval.

EXAMPLES

ctlstat -t

Display total statistics for the system with a one second interval.

ctlstat -d -l 5 -C

Display average DMA time for LUN 5 and omit CPU utilization.

ctlstat -n 7 -w 10

Display statistics for the first 7 LUNs, and display average statistics every 10 seconds.

SEE ALSO

cam(3), cam(4), ctl(4), xpt(4), camcontrol(8), ctladm(8), iostat(8)

AUTHORS

Ken Merry <ken@FreeBSD.org> Will Andrews <will@FreeBSD.org>