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