System and method for improved snapclone performance in a...

Details System and method for improved snapclone performance in a... System and method for improved snapclone performance in a...

2011-05-03

2011-05-03

Lane, Jack A (Department: 2185)

Electrical computers and digital processing systems: memory

Storage accessing and control

Control technique

C711S161000, C707S639000, C707S657000, C707S659000

Reexamination Certificate

active

07937548

ABSTRACT:
A system and method of creating a snapclone for on-line point-in-time complete backup in a virtualized storage system is disclosed. In one embodiment, a method for creating a snapclone for on-line point-in-time complete backup in a virtualized storage system includes receiving a copy operation directed to one or more identified segments of an original virtual disk, in response to the copy operation, substantially sequentially copying the one or more identified segments to a snapclone virtual disk, clearing bits in an in-memory sharing bitmap associated with already copied one or more identified segments, and writing the cleared bits in the in-memory sharing bitmap to a disk resident virtual disk metadata associated with the snapclone virtual disk upon receiving a current write I/O operation while the copy operation is in progress. The received current write I/O operation is targeting data outside the LBA range of the already copied one or more identified segments.

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http://en.wikipedia.org/wiki/Logical—Volume—Manager—(Linux), Jan. 24, 2011.

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