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