Patent ID: 8364919

Claim:
A remote copy system comprising: a first storage system managing a first logical volume as a primary logical volume for a synchronous copy pair, a second storage system managing a virtual volume as a secondary logical volume for the synchronous copy pair and a primary logical volume for an asynchronous copy pair, and a third storage system managing a second logical volume as a secondary logical volume for the asynchronous copy pair and storing a copy of data, wherein, after changing a state of an asynchronous copy using the asynchronous copy pair to a state of copying, the remote copy system is configured to change a state of a synchronous copy using the synchronous copy pair to a state for copying while the state of the asynchronous copy is in the state for copying so that the data stored in the first logical volume is transferred from the first storage system to the third storage system via the virtual volume of the second storage system based on the synchronous copy and asynchronous copy.