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