Patent ID: 7103727

Claim:
A storage system connected among a plurality of storage systems, comprising: a storage control unit; and a storage unit connected to said storage control unit; wherein said storage control unit includes a management information memory for storing management information for managing data, said management information including a target flag; wherein said target flag indicating that a target volume is either a copy source or a copy destination; wherein said management information memory has first and second source information about said plurality of storage systems; wherein said storage control unit receives data sent from a first storage system in response to said target flag being set when said first source information includes information of said first storage system, and performs processing for directly receiving, by changing said second source information from said first to second storage system, data from said second storage system in response to said target flag being set when said first source information includes information of said second storage system and when data cannot be received from said first storage system for a predetermined period of time; and wherein when said storage control unit receives information of restoration of said first storage system, said storage control unit changes said second source information from said second to said first storage system to receive data from said first storage system.