receiving by a data migration node in a network an indicator that the data migration node is responsible for managing {HEAD ~ data migration} from a first storage to {TAIL ~ a second storage} 
receiving by a data migration node in a network an indicator that the data migration node is responsible for managing { HEAD ~ data migration } from a first storage to { TAIL ~ a second storage }
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 HEAD OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL