If you are using a volume manager for Oracle Database files, the volume manager requires a global device group for the Support for Oracle RAC database to use.
The type of global device group to create depends on the volume manager that you are using:
If you are using Solaris Volume Manager for Sun Cluster, create a multi-owner disk set. See How to Create a Multi-Owner Disk Set in Solaris Volume Manager for Sun Cluster for the Oracle RAC Database.