Reuse a LUN Post: 302688017

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LEARN ABOUT FREEBSD

ctlstat

CTLSTAT(8)						    BSD System Manager's Manual 						CTLSTAT(8)

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 aver-
     age 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 com-
		 puted 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>

BSD
								   March 6, 2013							       BSD

10 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

How to reuse same major number

Discussion started by: Agnello

2. UNIX for Advanced & Expert Users

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Discussion started by: rtoba

3. HP-UX

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Discussion started by: zetadhell

4. Linux

suggest some ideas for reuse

Discussion started by: infyanurag