Starting and Stopping Individual Nodes

At different times, you may need to remove a node from active cluster operation for maintenance or upgrade activities such as adding a peripheral, recabling or other activities. To do such maintenance, you remove the node from the cluster temporarily. This action does not change the cluster configuration. When the maintenance is finished, you return the node to cluster operation. During the maintenance of the inactive node, the cluster still operates using the other node.

Stopping a node in this way has the effect of running the OPS halt script (if it is configured) on that node to halt the operation of OPS and OPS applications. Restarting the node has the effect of running the OPS start script (if it is configured) on that node to bring up Oracle Parallel Server and its applications.

Using SAM to Remove a Node from the Cluster Temporarily

1. Run SAM, and choose the High Availability options.

2. Choose Cluster Administration, and select "Specify Node to Leave the Cluster." From the select list, choose the node that is to be temporarily removed.

3. Respond Yes to the verification prompt.

This sequence of steps runs the OPS halt script to halt the Oracle instance on the specified node.

Using HP-UX Commands to Remove a Node from the Cluster Temporarily

1. Use the cmhaltpkg command to halt any running packages.

2. Stop OPS.

3. Use vgchange -a n volumegroup to deactivate volume groups used by OPS.

4. Use the cmhaltnode command on the node that is being removed.

   	NOTE: The cmhaltnode command will not halt a node if the cluster has not yet formed. Use SAM or the cmviewcl command to verify that the cluster is running before issuing the cmhaltnode command.

Using SAM to Return a Node to the Cluster

1. Run SAM, and choose the High Availability options.

2. Choose Cluster Administration, and select "Specify Node to Join the Cluster." From the select list, choose the node that is to be added back to the cluster.

3. Respond Yes to the verification prompt.

This sequence of steps runs the OPS start script to start the Oracle instance on the specified node.

Using HP-UX Commands to Return a Node to the Cluster

Use the cmrunnode command from the node that you wish to add back to the cluster. This command also runs the OPS start script (if it is configured) to start the Oracle instance on the specified node.