When the data migration from the first storage to the second storage is completed, the network device notifies {HEAD ~ the other network devices} in {TAIL ~ 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 the data migration from the first storage to the second storage is completed , the network device notifies { HEAD ~ the other network devices } in { TAIL ~ 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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