HP XP Array Manager Software - Manual (Page 95)

It is also possible to share physical resources (such as parity groups or storage ports) among
departments, and divide only logical resources (such as LDEV IDs or host group numbers) by
department. For example, you can assign resource groups that contain shared physical resources to
all departments and then assign individual resource groups that contain specific logical resources to
the appropriate departments. This allows department administrators to use only the resources assigned
to them, while still allowing for effective sharing of physical resources.
Resource groups
Resources are grouped by storage system, parity group, LDEV ID, storage port, etc.
Three types of resource groups exist:
User Guide 95