Patent ID: 7565503

Claim:
A method for performing data migration in a first apparatus to be coupled to a first storage system and a second storage system, the first storage system including a first storage volume storing write data from a host computer and the second storage system including a second storage volume to store copy data corresponding to the write data stored in the first storage volume based on configuration information including a relationship between the first storage volume and the second storage volume, the method comprising: receiving the configuration information at the first apparatus from the first storage system, the configuration information being replication configuration information for replicating data between the first storage system and the second storage system; mapping a first virtual volume to the first storage volume, based upon the received configuration information, for presenting the first storage volume via the first virtual volume to the host computer; sending to the second storage system by the first apparatus, based upon the received configuration information, a copy of write data associated with write requests received from the host computer directed to the first virtual volume; providing a second apparatus to be the first apparatus and the second storage system; receiving the configuration information by the second apparatus; and mapping a second virtual volume to the second storage volume, based upon the received configuration information, for presenting the second storage volume via the second virtual volume to the first apparatus; wherein the sending by the first apparatus the copy of the write data associated with write requests received from the host computer directed to the first virtual volume further comprises a step of sending the copy of the write data to said second apparatus for storage by said second apparatus into said second storage system via said second virtual volume.