NAME

       pmdagfs2 - Global Filesystem v2 (GFS2) PMDA

DESCRIPTION

       pmdagfs2  is  a  Performance Metrics Domain Agent (PMDA) which exports metric values about
       mounted GFS2 filesystems from the debugfs filesystem.  This PMDA  requires  debugfs  along
       with  at  least  one  mounted GFS2 filesystem to be mounted in order to be able to provide
       metric data.

       This PMDA can be used with GFS2 filesystems which are both mounted  as  local  filesystems
       and  filesystems  which  are   mounted  as  shared storage within a clustered environment.
       However there are some metrics which specifically require GFS2 to be setup in a  clustered
       environment  to  be  able  to  provide  metric data. This is due to them expecting locking
       messages to be passed via the distributed lock manager (DLM) between nodes of a cluster in
       order to generate their output.

       These  cluster-environment-only  metrics  can  be  distinguished by the inclusion of their
       corresponding control metrics so that they  can  be  optionally  enabled  or  disabled  on
       systems where they are not desired to be monitored or not supported.

       pmstore(3) can be used to assign values to these control metrics in order to enable (1) or
       disable (0) them.  This mechanism is also useful on distributions that  do  not  currently
       have full support for the GFS2 trace-points or provide older versions of the GFS2 driver.

       Further details on clustering and GFS2 can be found at http://redhat.com

INSTALLATION

       Install the GFS2 PMDA by using the Install script as root:

             # cd $PCP_PMDAS_DIR/gfs2
             # ./Install

       To uninstall, do the following as root:

             # cd $PCP_PMDAS_DIR/gfs2
             # ./Remove

       pmdagfs2  is  launched  by pmcd(1) and should never be executed directly.  The Install and
       Remove scripts notify pmcd when the agent is installed or removed.

FILES

       $PCP_PMDAS_DIR/gfs2/help
           default help text file for the GFS2 metrics

       $PCP_PMDAS_DIR/gfs2/Install
           installation script for the pmdagfs2 agent

       $PCP_PMDAS_DIR/gfs2/Remove
           undo installation script for the pmdagfs2 agent

       $PCP_LOG_DIR/pmcd/gfs2.log
           default log file for error messages from pmdagfs2

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

       pmcd(1), pmstore(1), and gfs2(5).