when the data migration from the first storage to the second storage is completed, notifying by the data migration node the one or more network devices in the network that {HEAD ~ traffic} that is received by {TAIL ~ the network devices} is no longer to be routed to the data migration node; and 
when the data migration from the first storage to the second storage is completed , notifying by the data migration node the one or more network devices in the network that { HEAD ~ traffic } that is received by { TAIL ~ the network devices } is no longer to be routed to the data migration node ; and
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 HEAD HEAD HEAD HEAD HEAD OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH