Patent ID: 7958168
Filing Date: 2011-06-07
Classification: G06F,Y10S

Abstract:
1. A method for restoring a virtual disk (vdisk) in a data storage system as the vdisk was at an earlier time, comprising: maintaining pointers pointing to data represented by the vdisk, the data stored on a data storage device of the data storage system; saving the pointers to persistent storage at the earlier time; maintaining the data at the earlier time on the data storage device; comparing a pointer pointing to the data represented by the vdisk at a later time with the pointers saved at the earlier time; if the pointer from the later time matches the pointer saved at the earlier time, keeping the pointer from the later time in an active file system of the data storage system; and if the pointer from the later time does not match the pointers saved at the earlier time, copying a set of pointers associated with the pointer saved at the earlier time to the active file system.