Using Serviceguard Extension for RAC, 5th Edition, June 2007

Maintenance and Troubleshooting
Managing the Shared Storage
Chapter 4218
This command is issued from the configuration node only, and the
cluster must be running on all nodes for the command to succeed.
Note that both the -S and the -c options are specified. The -S y
option makes the volume group shareable, and the -c y option
causes the cluster id to be written out to all the disks in the volume
group. In effect, this command specifies the cluster to which a node
must belong in order to obtain shared access to the volume group.
Making a Volume Group Unshareable
Use the following steps to unmark a previously marked shared volume
group:
1. Remove the volume group name from the ASCII cluster
configuration file.
2. Enter the following command:
# vgchange -S n -c n /dev/volumegroup
The above example marks the volume group as non-shared and not
associated with a cluster.
Activating an LVM Volume Group in Shared Mode
Activation and deactivation of shared volume groups is normally done
through a control script. If you need to perform activation from the
command line, you can issue the following command from each node to
activate the volume group in shared mode. (The node on which you first
enter the command becomes the server node.)
# vgchange -a s -p /dev/vg_ops
The following message is displayed:
Activated volume group in shared mode.
This node is the Server.
When the same command is entered on the second node, the following
message is displayed:
Activated volume group in shared mode.
This node is a Client.