NAME

       pmdalio - Linux LIO subsystem PMDA

DESCRIPTION

       pmdalio is a Performance Metrics Domain Agent (PMDA) which exports metric values about the
       Linux I/O target subsystem, which provides for protocols like  iSCSI,  FCP,  FCoE.   These
       allow  storage  available  on  one  host  to be exported and consumed by other hosts using
       industry standard protocols.

       This  PMDA  exports  summary  metrics  which  are  performance  value   aggregations   and
       configuration  per  LIO  target  instance.   Additional,  it  provides per LUN performance
       metrics including IOPS, and READ and WRITE throughput.

       The LIO configuration is maintained within the kernel's configfs virtual filesystem.   The
       python-rtslib  module  provides  an  interface to configfs, allowing tools like pmdalio to
       interact with the settings and metadata held in configfs.

INSTALLATION

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

             # cd $PCP_PMDAS_DIR/lio
             # ./Install

       To uninstall, do the following as root:

             # cd $PCP_PMDAS_DIR/lio
             # ./Remove

       pmdalio 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_PMDAS_DIR/lio/Install
           installation script for the pmdalio agent

       $PCP_PMDAS_DIR/lio/Remove
           undo installation script for the pmdalio agent

       $PCP_LOG_DIR/pmcd/lio.log
           default log file for error messages from pmdalio

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), pminfo(1) and pmpython(1).