adjusting at least a portion of the one of {TAIL ~ the storage spaces} for {HEAD ~ the logical data volume} to maintain the performance capabilities of each of the storage arrays within the predetermined range, 
adjusting at least a portion of the one of { TAIL ~ the storage spaces } for { HEAD ~ the logical data volume } to maintain the performance capabilities of each of the storage arrays within the predetermined range ,
OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL 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