| 摘要 |
A storage system including: a storage device which configures an original volume for storing data which is read/written by a host, a copy volume for storing a copy of the original volume at a predetermined timing, and a snapshot volume for storing a snapshot data which is a snapshot of the original volume; and a controller which controls access from the host to the storage device; wherein the controller: copies data of the original volume to the copy volume at a predetermined timing; stores the snapshot data in the snapshot volume corresponding to a write request to the original volume without decreasing a performance of the original volume; manages a generation of the stored snapshot according to predetermined copy volume blocks and snapshot volume blocks, and manages a generation of the copy volume; and reads data from the snapshot volume and/or the copy volume when a read request to a volume of a generation different from that of the original volume is received from the host, without decreasing a performance of the original volume.
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