Storage device and information management system

Details Storage device and information management system Storage device and information management system

2007-10-02

2010-12-28

Bragdon, Reginald G (Department: 2189)

Electrical computers and digital processing systems: memory

Storage accessing and control

Control technique

C711S161000

Reexamination Certificate

active

07861047

ABSTRACT:
Using a snapshot function, a remote copy is efficiently created. Data for a snapshot is converted into a first bitmap of differential data for a remote copy. The conversion is performed in advance at appropriate chronological intervals. Furthermore, when the snapshot function splits, a second bitmap of cascade differential data, which is new differential data, is created simultaneously with creation of the data for the snapshot. This second bitmap of cascade differential data is created in the same format as the first bitmap of differential data for the remote copy. Then, when the snapshot function shifts from split status to pair status, the second bitmap of cascade differential data is added to the first bitmap of differential data for the remote copy (to produce a logical sum), and a remote copy is created based on this bitmap that was added.

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