Using Serviceguard Extension for RAC, 4th Edition, February 2007

Maintenance and Troubleshooting
Managing the Shared Storage
Chapter 4196
NOTE Do not share volume groups that are not part of the RAC configuration
unless shared access is controlled.
Deactivating a Shared Volume Group
Issue the following command from each node to deactivate the shared
volume group:
# vgchange -a n /dev/vg_ops
Remember that volume groups remain shareable even when nodes enter
and leave the cluster.
NOTE If you wish to change the capacity of a volume group at a later time, you
must deactivate and unshare the volume group first. If you add disks,
you must specify the appropriate physical volume group name and make
sure the /etc/lvmpvg file is correctly updated on both nodes.
Making Offline Changes to Shared Volume Groups
You may need to change the volume group configuration of RAC shared
logical volumes to add capacity to the data files or to add log files. No
configuration changes are allowed on shared LVM volume groups while
they are activated. The volume group must be deactivated first on all
nodes, and marked as non-shareable. Use the following procedure
(examples assume the volume group is being shared by node 1 and node
2, and they use the volume group vg_ops):
1. Ensure that the Oracle RAC database is not active on either node.
2. From node 2, use the vgchange command to deactivate the volume
group:
# vgchange -a n /dev/vg_ops
3. From node 2, use the vgexport command to export the volume
group:
# vgexport -m /tmp/vg_ops.map.old /dev/vg_ops
This dissociates the volume group from node 2.