{HEAD ~ The data} are migrated into RAID 5 configurations as a background operation, to minimize {TAIL ~ the disk space} lost 
are migrated to minimize
{ HEAD ~ The data } are migrated into RAID 5 configurations as a background operation , to minimize { TAIL ~ the disk space } lost
HEAD HEAD HEAD HEAD HEAD HEAD REL REL OTH OTH OTH OTH OTH OTH OTH OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH