Storage subsystem and storage system for updating snapshot...

Details Storage subsystem and storage system for updating snapshot... Storage subsystem and storage system for updating snapshot...

2011-04-05

2011-04-05

Gu, Shawn X (Department: 2189)

Electrical computers and digital processing systems: memory

Storage accessing and control

Control technique

C711S114000, C711S156000, C711S170000, C711SE12001

Reexamination Certificate

active

07921269

ABSTRACT:
The first storage subsystem, when new data is written in a first memory device beyond a certain timing, writes pre-updated data prior to update by said new data into a pre-updated data memory region and, in addition, updates snapshot management information that expresses a snapshot of a data group within the first memory device to information that expresses the snapshot at the certain timing and, at a later timing than the certain timing, judges, on the basis of the snapshot management information, in which of either the pre-updated data memory region or the first memory device the data constituting the data group at a certain timing exists, acquires data from the one in which the data exists and writes it into the second memory device of the second storage subsystem, and generates the certain timing repeatedly.

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Notification of Reason(s) for Refusal dated Aug. 17, 2010, issued in corresponding Japanese Patent Application No. 2005-045949 along with partial English language translation thereof.
Japanese Office Action dated Aug. 17, 2010, issued in corresponding Japanese Patent Application No. 2005-045949.

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