pmdaxfs(1) — Linux manual page


PMDAXFS(1)                 General Commands Manual                PMDAXFS(1)

NAME         top

       pmdaxfs - XFS filesystem performance metrics domain agent (PMDA)

SYNOPSIS         top

       $PCP_PMDAS_DIR/xfs/pmdaxfs [-d domain] [-l logfile]

DESCRIPTION         top

       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
            error instead.

INSTALLATION         top

       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
            # ./Remove

       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
            # ./Install

       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.

FILES         top

                 command line options used to launch pmdaxfs
                 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
                 from pmdaxfs


       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).

SEE ALSO         top

       PCPIntro(1), pmcd(1), pmstore(1), pcp.conf(5) and pcp.env(5).

COLOPHON         top

       This page is part of the PCP (Performance Co-Pilot) project.
       Information about the project can be found at ⟨⟩.
       If you have a bug report for this manual page, send it to  This page was obtained from the project's upstream
       Git repository ⟨⟩ 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
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       (which is not part of the original manual page), send a mail to

Performance Co-Pilot                 PCP                          PMDAXFS(1)