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download PDF document: ctlstat.8.pdf

CTLSTAT(8) FreeBSD System Manager's Manual CTLSTAT(8)
NAME ctlstat - CAM Target Layer statistics utility
SYNOPSIS ctlstat [-t] [-c count] [-C] [-d] [-D] [-j] [-P] [-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.
-P Prometheus dump mode. Dump statistics in a format suitable for ingestion into Prometheus. When invoked with this option, ctlstat dumps once, regardless of the -t option. This option is especially useful when invoked by inetd(8). See the comments in /etc/inetd.conf for an example configuration.
-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.
every 10 seconds.
SEE ALSO cam(3), cam(4), ctl(4), xpt(4), camcontrol(8), ctladm(8), ctld(8), iostat(8), Prometheus project: https://prometheus.io/.
Prometheus exposition formats: https://prometheus.io/docs/instrumenting/exposition_formats/.
AUTHORS Ken Merry <ken@FreeBSD.org> Will Andrews <will@FreeBSD.org> Alexander Motin <mav@FreeBSD.org>
FreeBSD 14.2-RELEASE April 22, 2021 FreeBSD 14.2-RELEASE