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US Patent 6269431 - Virtual storage and block level direct access of secondary storage for recovery of backup data
US Patent Issued on July 31, 2001
Estimated Patent Expiration Date:
August 13, 2018Estimated 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.
Estimated Patent Expiration Date:
August 13, 2018Estimated 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.AbstractA data storage system has a primary data storage subsystem including primary data storage and a secondary data storage subsystem including secondary data storage. The secondary data storage contains backup versions of data stored in the primary data storage. To permit a host processor to access a specified backup version, the primary data storage subsystem assigns a virtual storage address to a specified backup version, and the host processor sends to the primary data storage subsystem data access requests that specify the virtual storage address. If the primary data storage subsystem has spare data storage, then a copy of the specified backup version is read from the secondary storage and written into the spare storage, and the address of the copy in the spare storage is mapped to the virtual storage address and accessed in response to the storage access requests from the host processor. Otherwise, a block-level direct access of the secondary storage is performed to access the specified backup version. In either case, the backup version appears to be in the primary data storage subsystem when the host accesses it.Other References
| InventorAssigneeApplicationNo. 133564 filed on 08/13/1998US Classes:711/162, Backup707/204, Archiving or backup711/6, Virtual machine memory addressing711/165Internal relocationField of Search711/2, Addressing extended or expanded memory711/4, Dynamic-type storage device (e.g., disk, tape, drum)711/6, Virtual machine memory addressing711/161, Archiving711/162, Backup711/165, Internal relocation707/2, Access augmentation or optimizing707/204, Archiving or backup707/205File allocationExaminersPrimary: Ellis, Richard L.Attorney, Agent or FirmUS Patent References4686620, Database backup methodIssued on: 08/11/1987 Inventor: Ng4755928, Outboard back-up and recovery system with transfer of randomly accessible data sets between cache and host and cache and tape simultaneously Issued on: 07/05/1988 Inventor: Johnson , et al.5060185, File backup system Issued on: 10/22/1991 Inventor: Naito, ;, , , --> Naito, et al.5175852, Distributed file access structure lock Issued on: 12/29/1992 Inventor: 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Foreign Patent References
International ClassG06F 012/08 |
