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