When {HEAD ~ the data migration} from {TAIL ~ the first storage} to the second storage is completed, the network device notifies the other network devices in the network that traffic that is received by the other network devices is no longer to be routed to the network device 
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When { HEAD ~ the data migration } from { TAIL ~ the first storage } to the second storage is completed , the network device notifies the other network devices in the network that traffic that is received by the other network devices is no longer to be routed to the network device
OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH