monitoring whether {TAIL ~ currently utilized performance capabilities} of each of {HEAD ~ the storage arrays} are within a predetermined range of maximum performance capabilities for the storage arrays; and 
monitoring whether { TAIL ~ currently utilized performance capabilities } of each of { HEAD ~ the storage arrays } are within a predetermined range of maximum performance capabilities for the storage arrays ; and
OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH