Snapshot system

Electrical computers and digital processing systems: memory – Storage accessing and control – Control technique

Reexamination Certificate

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Details

C707S793000

Reexamination Certificate

active

07606990

ABSTRACT:
A storage system including a snapshot volume arranged to provide each of a plurality of snapshot generations to the host as a virtual volume and to store data having an identical content in one storage area, and in that a management unit is arranged to: determine, when the host sends a request to create the original volume as a new volume of a designated generation, whether the designated generation is a generation of the copy volume or not; overwrite data in the copy volume for a block address of the designated generation indicating the snapshot volume if the generation of the copy volume is different from the designated generation; and change mapping information of the copy volume to the mapping information of the original volume.

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patent: 1 148 416 (2001-10-01), None
patent: 2002-278819 (2002-09-01), None
patent: 2004-164318 (2004-06-01), None

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