When {HEAD ~ the data migration} from the first storage to {TAIL ~ 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 
to
When { HEAD ~ the data migration } from the first storage to { TAIL ~ 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 OTH OTH OTH OTH 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