HP P6000 Cluster Extension Software Administrator Guide (5697-0986, June 2011)

3. Restart the node that was shut down.
NOTE:
The time to detect a storage outage due to failure of all paths to storage depends on the
setting for no_path_retry in the multipath software configuration. A value of fail does
not queue I/O in the event of a failure in all paths and returns an immediate failure. For
information about the recommended value for your environment, see the DM-Multipath
documentation.
Some resource agents, such as LVM, offer a mechanism called self_fence to take themselves
out of a cluster through node reboot when an underlying logical volume can no longer be
accessed. For supported options, see the RHCS documentation.
A data center is down (SLE HA and RHCS)
RHCS and SLE HA expect an acknowledgement from the fencing device before services are failed
over to another node. In the event of complete site failure, including fencing devices, clusters do not
automatically fail over services to surviving cluster nodes at the remote site. Manual intervention is
required in this situation. For instructions on bringing a service online, see the cluster software
documentation.
Troubleshooting106