When creating a virtual storage machine by using Resource Partition Manager (VSM manual configuration), you can create GAD pairs specifying a volume in a resource group that has the same serial number and model as the storage system for the S-VOL.
In this case, you must specify a volume in the resource group (virtual storage machine) whose serial number and model are same as the secondary storage system for the P-VOL.
When creating a virtual storage machine without using Resource Partition Manager (VSM auto-configuration), set the virtual serial number of the S-VOL and the physical serial number of the S-VOL to the same value before the GAD pair is created.
When you create GAD pairs, the virtual LDEV ID of the P-VOL is copied to the virtual LDEV ID of the S-VOL. In the following figure, the copied virtual LDEV ID of the P-VOL is equal to the original virtual LDEV ID of the S-VOL. The volume in a resource group that has the same serial number and the same model as the storage system and whose original LDEV ID is equal to the virtual LDEV ID will not be treated as a virtualized volume by the global storage virtualization function.
When virtual information is copied from the P-VOL to the S-VOL and the original emulation type and the virtual emulation type do not match, you cannot create GAD pairs. For example, when the copied virtual emulation type of the P-VOL is not the same as the original emulation type of the S-VOL. The virtual emulation type includes the virtual CVS attribute (-CVS).