In one embodiment, a network device in {TAIL ~ a network} obtains information identifying {HEAD ~ first storage} and second storage 
In one embodiment , a network device in { TAIL ~ a network } obtains information identifying { HEAD ~ first storage } and second storage
OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH