Using Serviceguard Extension for RAC, 3rd Edition, May 2006

Maintenance and Troubleshooting
Online Reconfiguration
Chapter 4 183
Online Reconfiguration
The online reconfiguration feature provides a method to make
configuration changes online to a Serviceguard Extension for RAC
(SGeRAC) cluster. Specifically, this provides the ability to add or/and
delete nodes from a running SGeRAC Cluster, and to reconfigure SLVM
VG while it is being accessed by only one node.
Online Node Addition and Deletion
Online node addition enables the addition or deletion of nodes in a
SGeRAC cluster to or from another running cluster.
Node(s) can be added and/or deleted by changing the cluster
configuration. This is done by editing the cluster specification file and
re-applying the configuration to the already running cluster. For
deleting online node(s), the node(s) needs to be halted before deleting
them from the cluster.
Use the following steps for adding a node using online node
reconfiguration:
1. Export the mapfile for the volume groups that needs to be visible in
the new node (vgexport -s -m mapfile -p <sharedvg>).
2. Copy the mapfile to the new node.
3. Import the volume groups into the new node. (vgimport -s -m
mapfile <sharedvg>).
4. Add node to the cluster online- edit the cluster configuration file to
add the node details and run cmapplyconf.
5. Make the new node join the cluster (cmrunnode) and run the
services.
Use the following steps for deleting a node using online node
reconfiguration:
1. Halt the node in the cluster by running cmhaltnode.
2. Edit the cluster configuration file to delete a node(s).
3. Run cmapplyconf.