Patent ID: 6823349
Filing Date: 2004-11-23
Classification: G06F,Y10S

Abstract:
A method for synchronizing a plurality of data images in a computer system, the plurality of data images including a primary image and at least one secondary image, the method comprising:receiving a write request from a host computer at a primary image site and at a secondary image site; writing to the primary image at the primary image site and attempting to write to the at least one secondary image at the at least one secondary image site; and in the event the write attempt to the at least one secondary image fails, creating a fracture log made up of a bitmap of the changed regions that have been effected on at least one disk containing the primary image at the primary image site, and which is representative of the blocks on the primary image which have changed at the primary image site, whereby the log can be used to synchronize the primary image and the secondary image.