{HEAD ~ The CSA primary device} then migrates {TAIL ~ a portion} of one of the logical data volumes from one storage array to another to balance the data transfer loads on the storage arrays 
migrates
{ HEAD ~ The CSA primary device } then migrates { TAIL ~ a portion } of one of the logical data volumes from one storage array to another to balance the data transfer loads on the storage arrays
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH