Patent ID: 7631158
Filing Date: 2009-12-08
Classification: G06F

Abstract:
1. A disk snapshot method, which is applied in a server comprising at least a memory and a hard disk, wherein said memory is divided into a kernel space and a user space in advance, and inside said kernel space there is a snapshot operating module, when receiving a create instruction sent by said snapshot operating module, said server performs disk snapshot comprising the steps of: grouping all disk chunks containing data in said hard disk as a volume; dividing a disk snapshot storage area in said hard disk, wherein the size of said disk snapshot storage area is equal to a space needed to copy all original data of the disk chunks belonged to the volume to said disk snapshot storage area; and creating a Copy-On-Write table in said user space, wherein said Copy-On-Write table comprises a plurality of lookup information and each of said lookup information comprises an original address and a snapshot address corresponding to said original address.