Using Serviceguard Extension for RAC, 10th Edition, April 2011

If you are adding or removing shared LVM volume groups, make sure that you modify the cluster
configuration file and any package control script that activates and deactivates the shared LVM
volume groups.
Changing the CVM Storage Configuration
To add new CVM disk groups, the cluster must be running.
If you are creating new CVM disk groups, be sure to determine the master node on which to do
the creation by using the following command:
# vxdctl -c mode
One node will identify itself as the master. Create disk groups from this node.
Similarly, you can delete CVM disk groups provided they are not being used by a cluster node at
the time.
NOTE: For CVM without CFS, if you are adding a disk group to the cluster configuration, make
sure you also modify any package or create the package control script that imports and deports
this disk group. If you are adding a CVM disk group, be sure to add the STORAGE_GROUP entry
for the disk group to the package ASCII file.
For CVM with CFS, if you are adding a disk group to the cluster configuration, make sure you also
create the corresponding multi-node package. If you are adding a CVM disk group, be sure to
add to the packages the necessary package dependency that depend on the CVM disk group.
If you are removing a disk group from the cluster configuration, make sure that you also modify
or delete any package control script that imports and deports this disk group. If you are removing
a CVM disk group, be sure to remove the STORAGE_GROUP entries for the disk group from the
package ASCII file.
When removing a disk group that is activated and deactivated through a multi-node package,
make sure to modify or remove any configured package dependencies to the multi-node package.
Removing Serviceguard Extension for RAC from a System
If you wish to remove a node from Serviceguard Extension for RAC operation, use the swremove
command to delete the software. Note the following:
• The cluster service should not be running on the node from which you will be deleting
Serviceguard Extension for RAC.
• The node from which you are deleting Serviceguard Extension for RAC should not be in the
cluster configuration.
• If you are removing Serviceguard Extension for RAC from more than one node, swremove
should be issued on one node at a time.
NOTE: After removing Serviceguard Extension for RAC, your cluster will still have Serviceguard
installed. For information about removing Serviceguard, refer to the Managing Serviceguard user
guide for your version of the product.
Monitoring Hardware
Good standard practice in handling a high-availability system includes careful fault monitoring so
as to prevent failures if possible, or at least to react to them swiftly when they occur.
The following should be monitored for errors or warnings of all kinds.
• Disks
• CPUs
• Memory
132 Maintenance