Managing Serviceguard 12th Edition, March 2006

Cluster and Package Maintenance
Reconfiguring a Cluster
Chapter 7348
Changing the VxVM or CVM Storage Configuration
You can add VxVM disk groups to the cluster configuration while the
cluster is running. To add new CVM disk groups, the cluster must be
running.
Create CVM disk groups from the CVM Master Node:
• For CVM 3.5, and for CVM 4.1 without CFS, edit the configuration
ASCII file of the package that uses CVM storage. Add the CVM
storage group in a STORAGE_GROUP statement. Then issue the
cmapplyconf command.
• For CVM 4.1 with CFS, edit the configuration ASCII file of the
package that uses CFS. Fill in the three-part DEPENDENCY
parameter. Then issue the cmapplyconf command.
Similarly, you can delete VxVM or CVM disk groups provided they are
not being used by a cluster node at the time.
NOTE 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 disk group
managed by CVM without CFS, be sure to remove the STORAGE_GROUP
entries for the disk group from the package ASCII file. If you are
removing a disk group managed by CVM with CFS, be sure to remove
the DEPENDENCY parameter.
Serviceguard manages the VERITAS processes, specifically gab and LLT.
As a result, the administration commands such as gabconfig, llthosts,
and lltconfig should never be used for administering a cluster. It is
safe to use the read-only uses of these commands, such as gabconfig -a.
But an administrative command could potentially crash nodes or an
entire cluster.