Patent ID: 8904133

Claim:
A storage system for migrating a source remote copy configuration in a source storage system to a destination storage system as a destination remote copy configuration, the storage system comprising: the source storage system including the source remote copy configuration comprised of a primary volume provided by a source primary storage apparatus and a secondary volume provided by a source secondary storage apparatus; and the destination storage system, coupled to the source storage system, including a primary volume provided by a destination primary storage apparatus and a secondary volume provided by a destination secondary storage apparatus so that the primary volume of the destination primary storage apparatus and the secondary volume of the destination secondary storage apparatus are able to configure the destination remote copy configuration, wherein the destination primary storage apparatus of the destination storage system is configured to: define a virtual volume mapped to the primary volume provided by the source primary storage apparatus which is a storage area of the virtual volume; take over a first identifier of the primary volume of the source primary storage apparatus, to the virtual volume, the first identifier provided for a host computer as an identifier of the virtual volume; transfer, when the virtual volume receives an access request from the host computer, the access request to the source primary storage apparatus to write data in the primary volume provided by the source primary storage apparatus; and take over the first identifier from the virtual volume to the primary volume of the destination primary storage apparatus, after completion of a copy of data stored in the primary volume of the source primary storage apparatus into both the primary volume of the destination primary storage apparatus and the secondary volume of the destination secondary storage apparatus, and wherein, when the destination primary storage apparatus of the destination storage system receives a write request from the host computer after taking over the first identifier from the virtual volume to the primary volume of the destination primary storage apparatus, the destination primary storage apparatus of the destination storage system is configured to: write data related to the write request to the primary volume of the destination primary storage apparatus; and copy the data between the primary volume provided by the destination primary storage apparatus and the secondary volume provided by the destination secondary storage apparatus which comprise the destination remote copy configuration.