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Man Pages


Manual Reference Pages  -  CTLSTAT (8)

NAME

ctlstat - CAM Target Layer statistics utility

CONTENTS

Synopsis
Description
Examples
See Also
Authors

SYNOPSIS

ctlstat [-t] [-c count] [-C] [-d] [-D] [-j] [-l lun] [-n numdevs] [-p port] [-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 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 CPU statistics display.
-d Display DMA operation time (latency) instead of overall I/O time (latency).
-D Text dump mode. Dump 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 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.
-n numdevs
  Display statistics for this many devices.
-p port
  Request statistics for the specified port.
-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), ctld(8), iostat(8)

AUTHORS


.An Ken Merry Aq ken@FreeBSD.org
.An Will Andrews Aq will@FreeBSD.org
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