Patent ID: 7328373

Claim:
A data processing system, comprising: a primary site which includes a first computer and a first storage system connected to said first computer, said first storage system having a first logical volume for storing data sent from said first computer, said first logical volume related to at least one disk drive in said first storage system; and a secondary site which includes a second computer and a second storage system connected to said second computer, said second storage system having a second logical volume related to at least one disk drive in said second storage system, said second logical volume forming a pair relationship of a remote copy process with said first logical volume and storing data already stored in said first logical volume; wherein, said first storage system and said second storage system are connected to each other via a communication line; said first storage system records update history of data as a journal in a storage device stores update data to be stored in said first logical volume into at least one of third logical volumes, and transfers said update data stored in said at least one of third logical volumes to said second storage system via said communication line in such a way that said second computer is not in a transport path of said transferred update data from said first storage system to said second storage system; said second storage system stores said transferred update data into said second logical volume; and said at least one of said third logical volumes is switched to another one of said third logical volumes during said remote copy process.