pmdalustre is a Performance Metrics Domain Agent (PMDA) which reads
and exports metric values from the statistics interfaces of a Lustre
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:
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 variabes 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
If you want to undo the installation, do the following as root:
# cd $PCP_PMDAS_DIR/lustre
pmdalustre is launched by pmcd(1) and should never be executed
directly. The Install and Remove scripts notify pmcd(1) when the
agent is installed or removed.
installation script for the pmdalustre agent
undo installation script for the pmdalustre agent
default log file for error messages from pmdalustre$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).
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@example.com. This page was obtained from the project's upstream
Git repository ⟨https://github.com/performancecopilot/pcp.git⟩ on
2020-08-13. (At that time, the date of the most recent commit that
was found in the repository was 2020-08-11.) 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
Performance Co-Pilot PCP PMDALUSTRE(1)