Patent ID: 7865767

Claim:
A storage system having a plurality of sites, comprising: communication paths set in advance between a prescribed plurality of sites of the respective sites; a copy controller for copying data among a plurality of sites pre-selected from the respective sites via a copy path, which is configured using the pre-selected plurality of sites and a plurality of communication paths pre-selected from the respective communication paths; a failure detector for detecting whether or not a failure has occurred during data copying by the copy controller; a candidate detector for detecting at least one copy path candidate when occurrence of the failure is detected by the failure detector; and a resume controller, which when there are a plurality of the copy path candidates detected by the candidate detector, selects one from among the plurality of copy path candidates as a new copy path, and resumes data copying by the copy controller using this new copy path, wherein the candidate detector detects at least one path available for the data copying based on information related to available communication paths and available sites, respectively evaluates these detected available paths based on a preset first evaluation criterion, and detects the available candidate for which the evaluation result is the best as the copy path candidate, and wherein the first evaluation criterion is the size of the number of the sites included in the available oaths, and the better evaluation results are obtained as the number of sites included in the available oaths increases.