Patent ID: 8347051

Claim:
A storage apparatus including a remote data copy function, the storage apparatus comprising: a second volume which stores data serving as a copying source of data to be stored in a first volume serving as a data copying destination in another storage apparatus; a session establishing unit which establishes a session between the second volume and the first volume; a copy directing unit which directs a volume, including a free area, in the other storage apparatus such that data equivalent to the data to be stored in the first volume is copied, in response to a copy setting command issued by a server; a recording unit which records a data copy completion area in which a data copy from the second volume to the first volume is completed; a detection unit which detects a data copy completion area in a third volume serving as a local copying destination for the first volume based on the data copy completion area recorded in the recording unit and a data copy completion area in the first volume when determining a failure has occurred in the first volume; and a session terminating unit which terminates the session between the second volume and the first volume when determining the failure has occurred in the first volume, and wherein the session establishing unit establishes a session between the third volume and the second volume when determining the failure has occurred in the first volume.