Patent ID: 7693885

Claim:
A data recovery method in an information processing system having a computer, management computer, and a storage system, comprising: receiving write requests from the computer at the storage system; storing data related to the write requests in a data volume of the storage system; storing a plurality of journals related to the write requests in the storage system; storing a plurality of snapshots, each corresponding to the data volume, in the storage system; managing a relationship between the plurality of journals and the plurality of the snapshots and an RTO (Recovery Time Objective) threshold configured at the management computer; identifying a part of the plurality of journals corresponding to a certain snapshot of the plurality of snapshots; determining whether a time of the data recovery using the part of the plurality of journals and the certain snapshot exceeds the RTO threshold; identifying at least one of the journals among the part of the plurality of journals to be applied to the certain snapshot based on the RTO threshold, according to the determining step; applying said at least one journal identified to the certain snapshot to update or create another snapshot; and creating data of the data volume at a specific point in time designated by an administrator, using the another snapshot and at least journals specified at the specific point in time.