pmdaxfs is a Performance Metrics Domain Agent (PMDA) which extracts
performance metrics describing the state of the XFS filesystem from
the Linux kernel.
The xfs PMDA exports metrics that measure information about metadata
buffer usage, the journal, btree operations, inode operations,
extended attributes, directories, quotas, read and write operation
counts and of course throughput.
The PMDA provides a facility to reset the values of all counters to
zero using pmstore(1) with the xfs.control.reset metric.
A brief description of the pmdaxfs command line options follows:
-d It is absolutely crucial that the performance metrics domain
number specified here is unique and consistent. That is, domain
should be different for every PMDA on the one host, and the same
domain number should be used for the same PMDA on all hosts.
-l Location of the log file. By default, a log file named xfs.log
is written in the current directory of pmcd(1) when pmdaxfs 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
The xfs PMDA is installed and available by default on Linux. If you
want to undo the installation, do the following as root:
# cd $PCP_PMDAS_DIR/xfs
If you want to establish access to the names, help text and values
for the XFS performance metrics once more, after removal, do the
following as root:
# cd $PCP_PMDAS_DIR/xfs
pmdaxfs is launched by pmcd(1) and should never be executed directly.
The Install and Remove scripts notify pmcd(1) when the agent is
installed or removed.
command line options used to launch pmdaxfs$PCP_PMDAS_DIR/xfs/help
default help text file for the xfs metrics
installation script for the pmdaxfs agent
undo installation script for the pmdaxfs agent
default log file for error messages and other information
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
firstname.lastname@example.org. This page was obtained from the project's upstream
Git repository ⟨https://github.com/performancecopilot/pcp.git⟩ on
2020-07-14. (At that time, the date of the most recent commit that
was found in the repository was 2020-07-14.) 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
Performance Co-Pilot PCP PMDAXFS(1)