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
-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
-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
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
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.
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).
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
firstname.lastname@example.org. This page was obtained from the project's upstream
Git repository ⟨git://git.pcp.io/pcp⟩ on 2017-03-13. 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
Performance Co-Pilot PCP PMLOGLABEL(1)