Disk snapshot acquisition method

Details Disk snapshot acquisition method Disk snapshot acquisition method

2007-02-23

2010-10-05

Ellis, Kevin L (Department: 2187)

Electrical computers and digital processing systems: memory

Storage accessing and control

Control technique

C707S999203, C707S999204, C711S161000, C711S170000, C711S171000, C711S173000

Reexamination Certificate

active

07809908

ABSTRACT:
A disk snapshot acquisition method, which is applied in a server comprising a memory allocated with a kernel space and a hard disk, comprises the steps of allocating all chunks having data stored as a disk volume in said hard disk; allocating a first portion and a second portion in said hard disk; establishing a snapshot pointer in said kernel space, said snapshot pointer pointing to a starting address of said first portion in said hard disk; and when original data in one of said chunks of said disk volume is to be modified, duplicating said original data to a chunk in said second portion as backup data, then modifying said original data into modified data, and storing a piece of mapping information comprising an address of said modified data and an address of said backup data corresponding to said modified data to a copy-on-write table in said first portion.

REFERENCES:
patent: 6081875 (2000-06-01), Clifton et al.
patent: 7631158 (2009-12-01), Chen
patent: 2007/0106701 (2007-05-01), Periyasamy
patent: 2007/0156985 (2007-07-01), Tsai et al.

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