wherein a second disk device is coupled to {TAIL ~ said intermediary device} via a second disk port of the second disk device and a second intermediary port of {HEAD ~ the intermediary device} and 
wherein a second disk device is coupled to { TAIL ~ said intermediary device } via a second disk port of the second disk device and a second intermediary port of { HEAD ~ the intermediary device } and
OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH