Patent ID: 7330946

Claim:
A data processing system comprising: at least one first storage system; and at least one second storage system connected to the first storage system, wherein copying of data is carried out in a copy pair composed of one storage area as a copy source storage area belonging to the first storage system and one storage area as a copy destination storage area belonging to the second storage system, the second storage system includes: a copy processing module configured to receive from the first storage system a copy of data stored in a copy source storage area and store the received copy of data in a copy destination storage area in sequence matching storage sequence in the copy source storage area; a change information receiving module configured to receive change information identifying pre-change and post-change copy destination storage areas in a change process for changing a copy destination storage area of a target copy pair that is one of the copy pairs to another storage area belonging to the second storage system; a change information transmitting module configured to transmit the change information to the first storage system having a copy source storage area in the target copy pair; a copy information transmitting module configured to transmit copy information including data stored in the pre-change copy destination storage area in order to perform copying of data between the pre-change and post-change copy destination storage areas in association with the change process; and a change copy processing module configured to perform copying of data between the pre-change and post-change copy destination storage areas using the transmitted copy information, and the first storage system includes: a copy transmitting module configured to transmit a copy of data stored in a copy source storage area in a copy pair to the second storage system having a copy destination storage area referring to pair information identifying the copy source storage area and the copy destination storage area in the copy pair; and a pair information updating module configured to update the pair information according to the change information received from the second storage system.