Storage system and storage system management method

Details Storage system and storage system management method Storage system and storage system management method

2005-10-21

2008-09-02

Song, Jasmine (Department: 2188)

Electrical computers and digital processing systems: memory

Storage accessing and control

Control technique

C711S100000, C711S114000, C711S161000, C707S793000, C714S006130

Reexamination Certificate

active

07421550

ABSTRACT:
A storage system secures system redundancy through a simple configuration. A primary storage control device and first secondary storage control device are connected by a synchronous method, and the primary storage control device and a second secondary storage control device are connected by an asynchronous method. The primary storage control device sets control numbers for update data, and saves journal data. The primary storage control device transmits the update data to the first secondary storage control device. The first secondary storage control device writes update data to a first secondary volume, and uses a plurality of bitmap tables to manage differences. If the primary storage control device stops operation, the first secondary storage control device becomes the new primary storage control device. Differential copying is performed from the first secondary storage control device to the second secondary storage control device.

REFERENCES:
patent: 7017003 (2006-03-01), Murotani et al.
patent: 2005/0050288 (2005-03-01), Takahashi et al.
patent: 2005/0055523 (2005-03-01), Suishu et al.
patent: 2005-078453 (2003-09-01), None
patent: 2005-084953 (2003-09-01), None

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