One of the storage arrays is designated as {HEAD ~ a primary storage array}, which allocates and configures and then monitors and manages the logical data volumes according to {TAIL ~ specified requirements} of host devices that use the logical data volumes 
One of the storage arrays is designated as { HEAD ~ a primary storage array } , which allocates and configures and then monitors and manages the logical data volumes according to { TAIL ~ specified requirements } of host devices that use the logical data volumes
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH