Patent ID: 8566284

Claim:
A remote copy system comprising: a first storage system coupled to a host computer and having an original volume configured by a plurality of storage devices in the first storage system; a second storage system coupled to the first storage system and having a first logical volume and a first journal volume configured by a plurality of storage devices in the second storage system; and a third storage system coupled to the second storage system and having a second logical volume configured by a plurality of storage devices in the third storage system, wherein, when the original volume is updated with a write data, the first logical volume is updated with the write data and journal data including the write data and update information corresponding to the write data is written to the first journal volume, wherein, in response to a request for a transmission of the journal data received from the third storage system, the second storage system sends the journal data to the third storage system and the third storage system updates the second logical volume with the write data based on the journal data.