Patent ID: 7318135
Filing Date: 2008-01-08
Classification: G06F,Y10S

Abstract:
1. A system for online data backup comprising: a storage device; a backup storage; and an intermediate storage, wherein a backup is performed online and copies data blocks from the storage device into the intermediate storage and then to the backup storage, wherein, in response to a “write” directed to a data block in the storage device that is subject to the online backup, if that data block has already been copied, then that data block is written to, and if the data block that is subject to the online backup is unavailable, that data block is marked as invalid and operations are continued with other data blocks in the storage device; wherein the system suspends writing to the storage device during the online data backup if the intermediate storage has reached a selected data capacity; and wherein the system slows down processes whose activity results in write operations into a non-backed-up area, in response to an indication that the intermediate storage device is close to overload.