Managing HP Serviceguard A.11.20.10 for Linux, December 2012

The typical corrective actions to take in the event of a transfer of package include:
• Determining when a transfer has occurred.
• Determining the cause of a transfer.
• Repairing any hardware failures.
• Correcting any software problems.
• Restarting nodes.
• Transferring packages back to their original nodes.
• Enabling package switching.
7.10 Single-Node Operation
In a multi-node cluster, you could have a situation in which all but one node has failed, or you
have shut down all but one node, leaving your cluster in single-node operation. This remaining
node will probably have applications running on it. As long as the Serviceguard daemon cmcld
is active, other nodes can rejoin the cluster.
If the Serviceguard daemon fails when the cluster is in single-node operation, it will leave the single
node up and your applications running
NOTE: This means that Serviceguard itself is no longer running.
It is not necessary to halt the single node in this scenario, since the application is still running, and
no other node is currently available for package switching. (This is different from the loss of the
Serviceguard daemon in a multi-node cluster, which halts the node (system reset), and causes
packages to be switched to adoptive nodes.)
You should not try to restart Serviceguard, since data corruption might occur if another node were
to attempt to start up a new instance of the application that is still running on the single node.
Instead of restarting the cluster, choose an appropriate time to shut down the applications and
reboot the node; this will allow Serviceguard to restart the cluster after the reboot.
7.11 Removing Serviceguard from a System
If you want to disable a node permanently from Serviceguard, use the rpm -e command to delete
the software.
CAUTION: Remove the node from the cluster first. If you run the rpm -e command on a server
that is still a member of a cluster, it will cause that cluster to halt, and the cluster to be deleted.
To remove Serviceguard:
1. If the node is an active member of a cluster, halt the node first.
2. If the node is included in a cluster configuration, remove the node from the configuration.
3. If you are removing Serviceguard from more than one node, run rpm -eon one node at a
time.
7.10 Single-Node Operation 239