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NAME | SYNOPSIS | DESCRIPTION | INSTALLATION | DEBUGGING OPTIONS | SEE ALSO | COLOPHON |
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PMDAZFS(1) General Commands Manual PMDAZFS(1)
pmdazfs - ZFS filesystem performance metrics domain agent (PMDA)
for Linux
$PCP_PMDAS_DIR/linux_zfs/pmdazfs [-D debug] [-d domain] [-l
logfile]
pmdazfs is a Performance Metrics Domain Agent (PMDA) which
extracts performance metrics describing the state of the ZFS
filesystem from the stats files located in /proc.
The zfs PMDA exports metrics that measure information about
caching (ARC, L2ARC, ZIL, VDEV), buffering, RAIDZ, dnode
operations and pools IO.
A brief description of the pmdazfs command line options follows:
-d The performance metrics domain number must be set to a unique
value.
-l Location of the log file. By default, a log file named
zfs.log is written in the current directory of pmcd(1) when
pmdazfs is started, i.e. $PCP_LOG_DIR/pmcd. If the log file
cannot be created or is not writable, output is written to
the standard error instead.
OpenZFS is not included in PCP, and has to be installed on the
system from the available packages or source. Once OpenZFS is
installed and configured, the stats files should appear in /proc
and PMDA can be added to PMCD using the Install script:
# cd $PCP_PMDAS_DIR/zfs
# ./Install
To remove PMDA use the Remove script:
# cd $PCP_PMDAS_DIR/zfs
# ./Remove
The -D or --debug option enables the output of additional
diagnostics on stderr to help triage problems, although the
information is sometimes cryptic and primarily intended to provide
guidance for developers rather end-users. debug is a comma
separated list of debugging options; use pmdbg(1) with the -l
option to obtain a list of the available debugging options and
their meaning.
Debugging options specific to pmdazfs are as follows:
┌────────┬────────────────────────────────────────────────────┐
│ Option │ Description │
├────────┼────────────────────────────────────────────────────┤
│ appl0 │ warn if any of the ZFS stats files cannot be found │
└────────┴────────────────────────────────────────────────────┘
PCPIntro(1), pmcd(1), pcp.conf(5) and pcp.env(5).
This page is part of the PCP (Performance Co-Pilot) project.
Information about the project can be found at
⟨http://www.pcp.io/⟩. If you have a bug report for this manual
page, send it to [email protected]. This page was obtained from the
project's upstream Git repository
⟨https://github.com/performancecopilot/pcp.git⟩ on 2025-08-11.
(At that time, the date of the most recent commit that was found
in the repository was 2025-08-11.) If you discover any rendering
problems in this HTML version of the page, or you believe there is
a better or more up-to-date source for the page, or you have
corrections or improvements to the information in this COLOPHON
(which is not part of the original manual page), send a mail to
[email protected]
Performance Co-Pilot PCP PMDAZFS(1)
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HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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