pmloglabel(1) — Linux manual page


PMLOGLABEL(1)            General Commands Manual           PMLOGLABEL(1)

NAME         top

       pmloglabel - check and repair a performance metrics archive label

SYNOPSIS         top

       pmloglabel [-lLsv?]  [-h hostname] [-p pid] [-V version] [-Z
       timezone] archive

DESCRIPTION         top

       pmloglabel verifies, reports on, and can modify all details of
       the labels in each of the files of a Performance Co-Pilot (PCP)
       archive.  The archive has the base name archive and must have
       been previously created using pmlogger(1).

       Each of the files in a PCP archive (metadata, temporal index, and
       one or more data volumes) must contain a valid label at the
       start, else the PCP tools will refuse to open the archive at all.

       Thus, the primary function of pmloglabel is to be able to repair
       any inconsistent or corrupt label fields, such that the entire
       archive is not lost.  It will not check the remainder of the
       archive, but it will give you a fighting chance to recover
       otherwise lost data.  Together, pmloglabel and pmlogextract are
       able to produce a valid PCP archive from many forms of

       Note that if the temporal index is found to be corrupt, the
       "*.index" file can be safely moved aside and the archive will
       still be accessible, however retrievals may take longer without
       the index.

OPTIONS         top

       The available command line options are:

       -h hostname, --host=hostname
            Modify the logged hostname in the archive label, for all
            files in the archive.

       -l, --label
            Dump out the archive label, showing the archive format
            version, the time and date for the start and (current) end
            of the archive, and the host from which the performance
            metrics values were collected.

       -L   Like -l, just a little more verbose, showing also the
            timezone and creator process identifier from the archive

       -p pid, --pid=pid
            Set the process identifier stored in the archive label to
            pid, for all files in the archive.

       -s   Rewrite the sentinel values which precede and follow the
            archive label, for all files in the archive.

       -v, --verbose
            Verbose mode.  Additional progress information is produced
            at each step.

       -V version, --version=version
            Stamp the version number into the magic number field at the
            start of the archive label, for all files in the archive.

       -Z timezone, --timezone=timezone
            Changes the timezone in the archive labels to timezone in
            the format of the environment variable TZ as described in

       -?, --help
            Display usage message and exit.

EXAMPLES         top

       The following demonstrates the use of pmloglabel in finding and
       then correcting a corrupt field (PID) in the label of the
       temporal index of an archive named "20080125".

                 $ pmdumplog -l 20080125
                 pmdumplog: Cannot open archive "20080125": Illegal label record at start of a PCP archive file
                 $ pmloglabel 20080125
                 Mismatched PID (5264/5011) between temporal index and data volume 0
                 $ pmloglabel -p 5264 20080125
                 $ pmdumplog -l 20080125
                 Log Label (Log Format Version 2)
                 Performance metrics from host fw1
                   commencing Fri Jan 25 00:10:09.341 2008
                   ending     Sat Jan 26 00:09:54.344 2008

EXIT STATUS         top

       pmloglabel exits with status 0 if the archive labels are clean.
       If invoked incorrectly, the exit status will be 1.  If corruption
       is detected and still exists at the end, the exit status will be
       2.  If requested to write out the archive labels, and some aspect
       of that write out fails, then the exit status will be 3.

FILES         top

            Default directory for PCP archives containing performance
            metric values collected from the host <hostname>.


       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

SEE ALSO         top

       PCPIntro(1), pmlogcheck(1), pmlogextract(1), pmlogger(1),
       pmlogger_check(1), pmlogger_daily(1), pmlogrewrite(1),
       pcp.conf(5) and pcp.env(5).

COLOPHON         top

       This page is part of the PCP (Performance Co-Pilot) project.
       Information about the project can be found at 
       ⟨⟩.  If you have a bug report for this manual
       page, send it to  This page was obtained from the
       project's upstream Git repository
       ⟨⟩ on 2023-12-22.
       (At that time, the date of the most recent commit that was found
       in the repository was 2023-12-16.)  If you discover any rendering
       problems in this HTML version of the page, or you believe there
       is a better or more up-to-date source for the page, or you have
       corrections or improvements to the information in this COLOPHON
       (which is not part of the original manual page), send a mail to

Performance Co-Pilot               PCP                     PMLOGLABEL(1)

Pages that refer to this page: pmlogdump(1)pmlogrewrite(1)