pmnsdel - delete a subtree of names from the Performance Co-Pilot PMNS
$PCP_BINADM_DIR/pmnsdel [-d] [-n namespace] metricpath [ ... ]
pmnsdel removes subtrees of names from a Performance Metrics Name Space (PMNS), as used by
the components of the Performance Co-Pilot (PCP).
Normally pmnsdel operates on the default Performance Metrics Namespace (PMNS), however if
the -n option is specified an alternative namespace is used from the file namespace.
The default PMNS is found in the file $PCP_VAR_DIR/pmns/root unless the environment vari-
able PMNS_DEFAULT is set, in which case the value is assumed to be the pathname to the
file containing the default PMNS.
The metric names to be deleted are all those for which one of the metricpath arguments is
a prefix in the PMNS, see pmns(5).
All of the files defining the PMNS must be located within the directory that contains the
root of the PMNS, and this would typically be $PCP_VAR_DIR/pmns for the default PMNS, and
this would typically imply running pmnsdel as root.
Provided some initial integrity checks are satisfied, pmnsdel will update the necessary
PMNS files. Should an error be encountered the original namespace is restored. Note that
any PMNS files that are no longer referenced by the modified namespace will not be
removed, even though their contents are not part of the new namespace.
The -d option allows the resultant PMNS to optionally contain duplicate PMIDs with differ-
ent names in the PMNS. By default this condition is considered an error.
Once the writing of the new namespace file has begun, the signals SIGINT, SIGHUP and
SIGTERM will be ignored to protect the integrity of the new files.
$PCP_VAR_DIR/pmns/root the default PMNS, when then environment variable PMNS_DEFAULT is
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 config-
uration file, as described in pcp.conf(5).
pmnsadd(1), pmnsmerge(1), pcp.conf(5), pcp.env(5) and pmns(5).
Performance Co-Pilot PCP PMNSDEL(1)