pmdaxfs - XFS filesystem performance metrics domain agent (PMDA)
$PCP_PMDAS_DIR/xfs/pmdaxfs [-d domain] [-l logfile]
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
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 config-
uration file, as described in pcp.conf(5).
PCPIntro(1), pmcd(1), pmstore(1), pcp.conf(5) and pcp.env(5).
Performance Co-Pilot PCP PMDAXFS(1)