pmdalio(1) — Linux manual page

PMDALIO(1)               General Commands Manual               PMDALIO(1)

NAME         top

       pmdalio - Linux LIO subsystem PMDA

DESCRIPTION         top

       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.
       Additionally, 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         top

       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         top

       $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         top

       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         top

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

COLOPHON         top

       This page is part of the PCP (Performance Co-Pilot) project.
       Information about the project can be found at 
       ⟨http://www.pcp.io/⟩.  If you have a bug report for this manual
       page, send it to pcp@groups.io.  This page was obtained from the
       project's upstream Git repository
       ⟨https://github.com/performancecopilot/pcp.git⟩ on 2025-08-11.
       (At that time, the date of the most recent commit that was found
       in the repository was 2025-08-11.)  If you discover any rendering
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       corrections or improvements to the information in this COLOPHON
       (which is not part of the original manual page), send a mail to
       man-pages@man7.org

Performance Co-Pilot               PCP                         PMDALIO(1)

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