Method for acquiring snapshot

Details Method for acquiring snapshot Method for acquiring snapshot

2008-01-29

2008-01-29

Shah, Sanjiv (Department: 2185)

Electrical computers and digital processing systems: memory

Storage accessing and control

Control technique

C711S161000, C711S147000, C711S100000

Reexamination Certificate

active

10927137

ABSTRACT:
In a storage switch to control a snapshot operation in the file unit, the delay in the writing operation of a host due to a data saving operation is prevented. In a snapshot acquiring method, the memory usage in a switch is reduced to create a snapshot. The storage switch includes a function to create a snapshot of a file. To prevent occurrence of delay due to the data saving operation, a mirror of source data as a snapshot target is kept in a source volume in any situation or according to a predetermined condition with synchronization established between the mirror and the source data. In the creation of the snapshot, the mirror data is used. By creating the mirror data in sequential positions in the source volume, the positional correspondence between the source side and the snapshot side is simplified.

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