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NAME | DESCRIPTION | INSTALLATION | FILES | PCP ENVIRONMENT | SEE ALSO | COLOPHON |
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PMDALUSTRE(1) General Commands Manual PMDALUSTRE(1)
pmdalustre - lustre filesystem statistics performance metrics
domain agent (PMDA)
pmdalustre is a Performance Metrics Domain Agent (PMDA) which
reads and exports metric values from the statistics interfaces of
a Lustre filesystem.
pmdalustre searches for statistics interfaces from several
locations, which vary depending on the version of Lustre
installed locally.
Recent Lustre versions (v2.12 and later) export statistics from
the kernel debugfs pseudo filesystem, in the directories
/sys/kernel/debug/lustre/llite and /sys/kernel/debug/lnet. If
these interfaces are not found during startup, pmdalustre will
automatically check if the statistics interfaces are available
from the procfs pseudo filesystem below the /proc/fs/lustre/llite
and /proc/sys/lnet directories. These are the default locations
of the statistics for Lustre versions less than v2.12.
If neither of the above filesystem interfaces are detected, or if
the user wants to override the default locations, pmdalustre also
supports an optional configuration file named
$PCP_PMDAS_DIR/lustre/lustre.conf. Note that $PCP_PMDAS_DIR is
set to /var/lib/pcp/pmdas on most Linux based systems. The
configuration file supports perl(1) variable assignment syntax.
An example configuration file suitable for Lustre v2.12 and later
is:
$LLITE_PATH="/sys/kernel/debug/lustre/llite/";
$LNET_PATH="/sys/kernel/debug/lustre/lnet/";
See comments in the shipped lustre.conf file for further details.
By default, this file is installed with everything commented (and
so it has no effect unless edited) because the built-in
heuristics used by pmdalustre should suffice.
Finally, overriding all of the above, the LUSTRE_LLITE_PATH and
LUSTRE_LNET_PATH environment variables may be set (and exported)
to specify the directory locations of the statistics interfaces
to be used. This mechanism using environment variables is
intended to be used for development and testing purposes only.
The pmdalustre process runs as the root user because debugfs
directories are not normally readable by unprivileged users.
Install pmdalustre by using the Install script as the root user:
# cd $PCP_PMDAS_DIR/lustre
# ./Install
If you want to undo the installation, do the following as root:
# cd $PCP_PMDAS_DIR/lustre
# ./Remove
pmdalustre is launched by pmcd(1) and should never be executed
directly. The Install and Remove scripts notify pmcd(1) when the
agent is installed or removed.
$PCP_PMDAS_DIR/lustre/Install
installation script for the pmdalustre agent
$PCP_PMDAS_DIR/lustre/Remove
undo installation script for the pmdalustre agent
$PCP_LOG_DIR/pmcd/lustre.log
default log file for error messages from pmdalustre
$PCP_PMDAS_DIR/lustre/lustre.conf
Configuration file for over-riding default statistics
directories used by pmdalustre.
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).
PCPIntro(1), perl(1), pmcd(1) and llstat(1).
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 pcp@groups.io. This page was obtained from the
project's upstream Git repository
⟨https://github.com/performancecopilot/pcp.git⟩ on 2024-06-14.
(At that time, the date of the most recent commit that was found
in the repository was 2024-06-14.) 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
man-pages@man7.org
Performance Co-Pilot PCP PMDALUSTRE(1)
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HTML rendering created 2024-06-26 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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