Snapshot system

Details Snapshot system Snapshot system

2008-04-08

2008-04-08

Lane, Jack (Department: 2185)

Electrical computers and digital processing systems: memory

Storage accessing and control

Control technique

C707S793000

Reexamination Certificate

active

10998755

ABSTRACT:
To obtain a volume image of a given generation. A storage system of this invention includes a disk device in which an original volume is provided to read/write data from a host, a copy volume is provided to store a copy of the original volume of a predetermined timing, and a snapshot volume is provided to store snapshot data of a snapshot of the original volume; and a storage control unit which includes a management unit for controlling the storage control unit, a channel I/F connected to the host, and a device I/F connected to the disk device, in which the management unit copies data of the original volume to the copy volume at a predetermined timing, stores the snapshot data of the snapshot in the snapshot volume corresponding to a write request in the original volume, 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 is received from the host.

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patent: 1 148 416 (2001-10-01), None
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