Machine manager 610 knows a location of each rack within the networks and each machine and {HEAD ~ the database} that is/are located within {TAIL ~ the rack} 
are located within
Machine manager 610 knows a location of each rack within the networks and each machine and { HEAD ~ the database } that is / are located within { TAIL ~ the rack }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL