Patent ID: 7865678

Claim:
A method of managing data, said method used for a remote copy system including a plurality of first storage systems and a plurality of second storage systems, comprising: storing pre-update data, which is updated when each of the first storage systems copies write data to each of the second storage systems, and write time of the pre-update data to each of the second storage systems, managing the latest write time and the earliest write time of the pre-update data in each of the second storage systems, collecting the latest write time and the earliest write time of the pre-update data from all of the second storage systems, obtaining a first time that is the earliest among the latest write times of all of the second storage systems, obtaining a second time that is the latest among the earliest write times of all of the second storage systems, enabling plural different times between the first time and the second time to be selectable as a recovery write time, and instructing all of the second storage systems to recover the data to the recovery write time.