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pmdaxfs(1) [centos man page]

PMDAXFS(1)						      General Commands Manual							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 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
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 follow- ing 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 configura- tion 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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PMDAJBD2(1)						      General Commands Manual						       PMDAJBD2(1)

NAME
pmdajbd2 - journal block device (JBD) performance metrics domain agent (PMDA) SYNOPSIS
$PCP_PMDAS_DIR/jbd2/pmdajbd2 [-d domain] [-l logfile] [-j path] [-U username] DESCRIPTION
pmdajbd2 is a Performance Metrics Domain Agent (PMDA) which extracts performance metrics from the Journal Block Device subsystem (version 2) in the Linux kernel. These metrics are exported by the kernel in procfs files, one file per block device. The JBD2 subsystem is used by several filesystems including ext3, ext4 and ocfs2. The jbd2 PMDA exports metrics that measure detailed journal transaction information, such as time spent waiting and locked, request rates, blocks used and so on. A brief description of the pmdajbd2 command line options follows (these are only relevant when running the PMDA as a daemon, and not as a shared library): -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, when running as a daemon a log file named jbd2.log is written in the current directory of when pmdajbd2 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. When running in shared library mode, and diagnostic information will be written into the pmcd log file, namely $PCP_LOG_DIR/pmcd/pmcd.log. -j Allows an alternate path to the jbd2 statistics files to be specified. The default path is /proc/fs/jbd2. -U User account under which to run the agent. The default is the unprivileged "pcp" account in current versions of PCP, but in older versions the superuser account ("root") was used by default. INSTALLATION
This PMDA is installed by default and in the shared library mode (rather than as a separate daemon to pmcd(1)). Thus, the names, help text and values for the jbd2 performance metrics should always be available. If you do not use these metrics you can remove this PMDA, do the following as root: # cd $PCP_PMDAS_DIR/jbd2 # ./Remove If you want to enable the installation again, do the following as root: # cd $PCP_PMDAS_DIR/jbd2 # ./Install pmdajbd2 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 pmdajbd2 $PCP_PMDAS_DIR/jbd2/help default help text file for the jbd2 metrics $PCP_PMDAS_DIR/jbd2/Install installation script for the pmdajbd2 agent $PCP_PMDAS_DIR/jbd2/Remove undo installation script for the pmdajbd2 agent $PCP_LOG_DIR/pmcd/jbd2.log default log file for error messages and other information from pmdajbd2 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 configura- tion file, as described in pcp.conf(5). SEE ALSO
PCPIntro(1), pmcd(1), pcp.conf(5) and pcp.env(5). Performance Co-Pilot PCP PMDAJBD2(1)
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