Patent ID: 8412935

Claim:
A storage system that administrates data to be mounted on a client terminal, the data being categorized into a plurality of generations, and that controls data in response to a request to mount data received from the client terminal, the storage system comprising: a storage unit that stores therein a first generation of data that is currently under operation as operational data, a second generation of data that had functioned as the operational data as backup data, and a third generation of data that is to be in operation as standby data; a database storage server that stores therein a table including disk information of the storage unit, the disk information being associated with each of the operational data, the backup data, and the standby data; a switching unit that modifies the disk information in the table by switching the first and the third generations such that the third generation is stored as the operational data, and the first generation is stored as the backup data, wherein only disk information in the table is modified and there is no change in volumes of the storage unit; a control unit that mounts the operation data stored in the storage unit onto the client terminal when receiving the request, and continues the mount on the client terminal by using the backup data when the switching unit switches generations while the operation data is mounted on the client terminal; and a disk operations unit that receives a control message from the switching unit to execute the deletion or copying of a volume thereby creating a new operating volume and giving the operating volume a name.