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PMDAXFS(1)							    PMDAXFS(1)

NAME
       pmdaxfs - XFS filesystem performance metrics domain agent (PMDA)

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

DESCRIPTION
       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 num‐
	    ber 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  cre‐
	    ated  or  is not writable, output is written to the standard error
	    instead.

INSTALLATION
       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
       $PCP_PMCDCONF_PATH
		 command line options used to launch pmdaxfs
       $PCP_PMDAS_DIR/xfs/help
		 default help text file for the xfs metrics
       $PCP_PMDAS_DIR/xfs/Install
		 installation script for the pmdaxfs agent
       $PCP_PMDAS_DIR/xfs/Remove
		 undo installation script for the pmdaxfs agent
       $PCP_LOG_DIR/pmcd/xfs.log
		 default  log  file  for  error messages and other information
		 from pmdaxfs

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

Performance Co-Pilot		      PCP			    PMDAXFS(1)

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