демон сборщика показателей производительности (performance metrics collector daemon)
AGENT FENCING
Preventing sampling during the life of a PMDA is sometimes
desirable, for example if that sampling impacts on sensitive
phases of a scheduled job. A temporary ``fence'' can be raised
to block all PMAPI client access to one or more agents in this
situation. This functionality is provided by the built-in PMCD
PMDA and the pmstore(1) command, as in
# pmstore -i nfsclient,kvm pmcd.agent.fenced 1
If the optional comma-separated list of agent names is omitted,
all agents will be fenced. To resume normal operation, the
``fence'' can be lowered as follows
# pmstore -i nfsclient,kvm pmcd.agent.fenced 0
Lowering the fence for all PMDAs at once is performed using
# pmstore pmcd.agent.fenced 0
Elevated privileges are required to store to the
pmcd.agent.fenced metric. For additional information, see the
help text associated with this metric, which can be accessed
using the -T, --helptext option to pminfo(1).
