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pmloglabel(1)


NAME

   pmloglabel - check and repair a performance metrics archive label

SYNOPSIS

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

DESCRIPTION

   pmloglabel verifies, reports on, and can  modify  all  details  of  the
   labels  in  each  of  the files of a Performance Co-Pilot (PCP) archive
   log.  The archive log 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 corruption.

   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.

   The options control the specific information to  be  reported,  or  the
   specific fields to be modified:

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

   -l   Dump out the archive label, showing the log  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 label.

   -p   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 mode.  Additional progress information is produced at each
        step.

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

   -Z   Changes  the  timezone  in  the  archive labels to timezone in the
        format of the environment variable TZ as described in environ(7).

EXAMPLES

   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 log 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

   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

   $PCP_LOG_DIR/pmlogger/hostname
             Default directory for  PCP  archives  containing  performance
             metric values collected from the host hostname.

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



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