Thus, a portion of the data stored on {HEAD ~ each} of {TAIL ~ the storage} arrays 114, 116 and 118 is migrated to the storage array 120 
Thus , a portion of the data stored on { HEAD ~ each } of { TAIL ~ the storage } arrays 114 , 116 and 118 is migrated to the storage array 120
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH