System and method of an efficient snapshot for shared large storage
Patent 7085899 Issued on August 1, 2006. Estimated Expiration Date: 
July 3, 2023. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
July 3, 2023. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesMechanism for incremental backup of on-line files Snapshot copy of a secondary volume of a PPRC pair Patent #: 6131148 InventorsAssigneeApplicationNo. 10612000 filed on 07/03/2003US Classes:711/161, Archiving711/162, Backup711/114Arrayed (e.g., RAIDs)ExaminersPrimary: Padmanabhan, ManoAssistant: Walter, Craig E Attorney, Agent or FirmInternational ClassG06F 12/00AbstractAn efficient snapshot technique based on a mapping for a large logical volume shared in multiple hosts. According to the present invention, problems of time delays in a conventional snapshot technique is solved by employing a FAB and an SSB, which are bits representing whether a COW operation is carried out to a mapping entry. In other words, the present invention solves the problems of delaying a write operation of corresponding volume, which is simultaneously executed when a snapshot is created, until the snapshot creation is completed.Other References
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