Patent ID: 6654830
Filing Date: 2003-11-25
Classification: G06F,H04L

Abstract:
An intermediate device for a storage network, comprising:a plurality of communication interfaces, the plurality of communication interfaces including at least a first interface adapted for communication with a first storage device which stores a data set, a second interface adapted for communication with a second storage device, and a third interface adapted for communication with a client processor; data transfer for resources coupled to the plurality of interfaces which transfer data access requests identifying the data set from the third interface to the first interface; a logic engine, coupled to the first and second interfaces, which in response to a control signal, manages transfer of the data set through the first interface from the first storage device and through the second interface to the second storage device; logic to assign a priority to the transfer in relation to data access requests from the client processor, and to manage the transfer in response to the priority; and, data structures which store status information concerning progress of the transfer, including a parameter indicating an extent of the data set which already copied to the second storage device.