Snapshot format conversion method and apparatus

Details Snapshot format conversion method and apparatus Snapshot format conversion method and apparatus

2008-06-24

2008-06-24

Sparks, Donald (Department: 2187)

Electrical computers and digital processing systems: memory

Storage accessing and control

Control technique

C711S112000, C711S114000, C711S161000, C707S793000, C707S793000

Reexamination Certificate

active

07392357

ABSTRACT:
A system according to this invention converts a full-copy snapshot into a differential snapshot. The system is composed of a storage subsystem and a server subsystem. The storage subsystem comprises a disk drive and a disk controller. The server subsystem comprises an interface, a processor, and a memory. The disk controller provides storage areas of the disk drive as logical volumes, and stores a differential block bitmap. The processor obtains the differential block bitmap, and identifies a block from the differential block bitmap. The processor obtains, from a full-copy snapshot volume, differential data that is stored in the identified block. The processor stores the obtained differential data in a differential volume. The processor stores, in differential block arrangement information, the location of the differential data stored in the differential volume.

REFERENCES:
patent: 6101497 (2000-08-01), Ofek
patent: 7237076 (2007-06-01), Nakano et al.
patent: 2004/0030727 (2004-02-01), Armangau et al.
patent: 2004/0186900 (2004-09-01), Nakano et al.
patent: 2005/0210193 (2005-09-01), Nagata
patent: 2007/0226730 (2007-09-01), Coyle et al.
patent: 2005-267569 (2004-03-01), None

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