PMLOGLABEL(1)PMLOGLABEL(1)NAMEpmloglabel - check and repair a performance metrics archive label
SYNOPSISpmloglabel [-Llsv] [-h hostname] [-p pid] [-V version] [-Z timezone]
archive
DESCRIPTIONpmloglabel 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 pre‐
viously 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 accessi‐
ble, 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 for‐
mat of the environment variable TZ as described in environ(5).
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 STATUSpmloglabel 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(4).
SEE ALSOPCPIntro(1), pmlogcheck(1), pmlogextract(1), pmlogger(1), pmlog‐
ger_check(1), pmlogger_daily(1), pmlogrewrite(1), pcp.conf(4), and
pcp.env(4).
Performance Co-Pilot SGI PMLOGLABEL(1)
