Patent ID: 8151069
Filing Date: 2012-04-03
Classification: G06F

Abstract:
1. A method of providing a multiple protection snapshot copy of a logical device, comprising: creating the snapshot copy of the logical device, wherein, in response to a write to a section of the logical device, original data of the section of the logical device is copied to a first alternative storage area prior to the write; following creating the snapshot copy, copying the original data to a second alternative storage area; after copying the original data to the second alternative storage area, pointing portions of the snapshot copy to the second alternative storage area, wherein data corresponding to the snapshot copy is stored in at least one of: the first alternative storage area and the second alternative storage area; copying data from particular sections of the logical device to the second alternative storage area, wherein the data from the particular sections is data not copied to the first alternative storage area; and pointing other portions of the snapshot copy to the data from the particular sections on the second alternative storage.