1PMDAXFS(1) General Commands Manual PMDAXFS(1)
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6 pmdaxfs - XFS filesystem performance metrics domain agent (PMDA)
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9 $PCP_PMDAS_DIR/xfs/pmdaxfs [-d domain] [-l logfile]
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12 pmdaxfs is a Performance Metrics Domain Agent (PMDA) which extracts
13 performance metrics describing the state of the XFS filesystem from the
14 Linux kernel.
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16 The xfs PMDA exports metrics that measure information about metadata
17 buffer usage, the journal, btree operations, inode operations, extended
18 attributes, directories, quotas, read and write operation counts and of
19 course throughput.
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21 The PMDA provides a facility to reset the values of all counters to
22 zero using pmstore(1) with the xfs.control.reset metric.
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24 A brief description of the pmdaxfs command line options follows:
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26 -d It is absolutely crucial that the performance metrics domain num‐
27 ber specified here is unique and consistent. That is, domain
28 should be different for every PMDA on the one host, and the same
29 domain number should be used for the same PMDA on all hosts.
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31 -l Location of the log file. By default, a log file named xfs.log is
32 written in the current directory of pmcd(1) when pmdaxfs is
33 started, i.e. $PCP_LOG_DIR/pmcd. If the log file cannot be cre‐
34 ated or is not writable, output is written to the standard error
35 instead.
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38 The xfs PMDA is installed and available by default on Linux. If you
39 want to undo the installation, do the following as root:
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41 # cd $PCP_PMDAS_DIR/xfs
42 # ./Remove
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44 If you want to establish access to the names, help text and values for
45 the XFS performance metrics once more, after removal, do the following
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48 # cd $PCP_PMDAS_DIR/xfs
49 # ./Install
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51 pmdaxfs is launched by pmcd(1) and should never be executed directly.
52 The Install and Remove scripts notify pmcd(1) when the agent is
53 installed or removed.
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56 $PCP_PMCDCONF_PATH
57 command line options used to launch pmdaxfs
58 $PCP_PMDAS_DIR/xfs/help
59 default help text file for the xfs metrics
60 $PCP_PMDAS_DIR/xfs/Install
61 installation script for the pmdaxfs agent
62 $PCP_PMDAS_DIR/xfs/Remove
63 undo installation script for the pmdaxfs agent
64 $PCP_LOG_DIR/pmcd/xfs.log
65 default log file for error messages and other information
66 from pmdaxfs
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69 Environment variables with the prefix PCP_ are used to parameterize the
70 file and directory names used by PCP. On each installation, the file
71 /etc/pcp.conf contains the local values for these variables. The
72 $PCP_CONF variable may be used to specify an alternative configuration
73 file, as described in pcp.conf(5).
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76 PCPIntro(1), pmcd(1), pmstore(1), pcp.conf(5) and pcp.env(5).
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80Performance Co-Pilot PCP PMDAXFS(1)