You may want to add shared storage to an existing Enterprise Vault cluster to provide more storage for an Enterprise Vault virtual server.
To add shared storage to an existing Microsoft cluster
Set up the additional shared disks and volumes, sharing the volumes on the nodes that require access to them.
Specify the required nodes as possible owners for the new Physical Disk resources, according to your cluster operation mode.
Test the modified cluster to confirm that the Enterprise Vault virtual server can access the new shared storage successfully before and after failover.