Managing HP Serviceguard for Linux Ninth Edition, April 2009

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.
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.
Removing Serviceguard from a System
If you want to disable a node permanently from Serviceguard use, 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:
Single-Node Operation 269