| 摘要 |
To obtain a volume image of a given generation. A storage system of this invention includes a disk device (300) in which an original volume (310) is provided to read/write data from a host (100), a copy volume (320) is provided to store a copy of the original volume (310) of a predetermined timing, and a snapshot volume (330) is provided to store snapshot data of a snapshot of the original volume (310); and a management unit, which stores the snapshot data of the snapshot in the snapshot volume (330) corresponding to a write request in the original volume (310), manages a generation of the created snapshot and a generation of the copy volume, and reads data from at least one of the snapshot volume and the copy volume when a read request from a volume of a generation different from that of the original volume (310) is received from the host (100). |
