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NAME | SYNOPSIS | DESCRIPTION | INSTALLATION | FILES | PCP ENVIRONMENT | DEBUGGING OPTIONS | SEE ALSO | COLOPHON |
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PMDAGFS2(1) General Commands Manual PMDAGFS2(1)
pmdagfs2 - Global Filesystem v2 (GFS2) PMDA
$PCP_PMDAS_DIR/gfs2/pmdagfs2 [-D debug]
pmdagfs2 is a Performance Metrics Domain Agent (PMDA) which
exports metric values about mounted GFS2 filesystems from the
debugfs filesystem. This PMDA requires debugfs along with at
least one mounted GFS2 filesystem to be mounted in order to be
able to provide metric data.
This PMDA can be used with GFS2 filesystems which are both mounted
as local filesystems and filesystems which are mounted as shared
storage within a clustered environment. However there are some
metrics which specifically require GFS2 to be setup in a clustered
environment to be able to provide metric data. This is due to them
expecting locking messages to be passed via the distributed lock
manager (DLM) between nodes of a cluster in order to generate
their output.
These cluster-environment-only metrics can be distinguished by the
inclusion of their corresponding control metrics so that they can
be optionally enabled or disabled on systems where they are not
desired to be monitored or not supported.
pmstore(3) can be used to assign values to these control metrics
in order to enable (1) or disable (0) them. This mechanism is
also useful on distributions that do not currently have full
support for the GFS2 trace-points or provide older versions of the
GFS2 driver.
Install the GFS2 PMDA by using the Install script as root:
# cd $PCP_PMDAS_DIR/gfs2
# ./Install
To uninstall, do the following as root:
# cd $PCP_PMDAS_DIR/gfs2
# ./Remove
pmdagfs2 is launched by pmcd(1) and should never be executed
directly. The Install and Remove scripts notify pmcd when the
agent is installed or removed.
$PCP_PMDAS_DIR/gfs2/help
default help text file for the GFS2 metrics
$PCP_PMDAS_DIR/gfs2/Install
installation script for the pmdagfs2 agent
$PCP_PMDAS_DIR/gfs2/Remove
undo installation script for the pmdagfs2 agent
$PCP_LOG_DIR/pmcd/gfs2.log
default log file for error messages from pmdagfs2
Environment variables with the prefix PCP_ are used to
parameterize the file and directory names used by PCP. On each
installation, the file /etc/pcp.conf contains the local values for
these variables. The $PCP_CONF variable may be used to specify an
alternative configuration file, as described in pcp.conf(5). [-D
debug]
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 pmdagfs2 are as follows:
┌────────┬───────────────────────────────────────────────────────┐
│ Option │ Description │
├────────┼───────────────────────────────────────────────────────┤
│ appl0 │ details of sbstats and worst_glock fetching and │
│ │ refreshing │
└────────┴───────────────────────────────────────────────────────┘
PCPIntro(1), pmcd(1), pmstore(1) and gfs2(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 PMDAGFS2(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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