HP SAN Virtualization Services Platform - Manual (Page 134)

Each such StorageResourceLoadGroup instance is associated to both Data Path Modules by two
instances of the association LoadGroupDPM. Properties on the association indicate which Data Path
Module has primary (IsPrimary) ownership of the virtual disks and which has active ownership (IsActive).
For virtual disk groups, the VirtualDisks/Snapshots that are members of a Group are collected directly
as members of a StorageResourceLoadGroup instance representing that Group; when using the
AssignStorageResourceAffinity method to reassign a Group, all virtual disks/snapshots that are
members of that group must also be specified/assigned in the same operation so that the group is
effectively assigned.
Storage Server Asymmetry Profile 134