Incremental disk backup system for a dynamically mapped data storage subsystem
September 12, 2010. 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 ReferencesVirtual storage system and method Outboard back-up and recovery system with transfer of randomly accessible data sets between cache and host and cache and tape simultaneously Memory back up system with one cache memory and two physically separated main memories Fast write operations Method and apparatus for database update/recovery Fault tolerant computer backup system Backup computer program for networks Patent #: 5133065 InventorsAssigneeApplicationNo. 582260 filed on 09/12/1990US Classes:714/6Redundant stored data accessed (e.g., duplicated data, error correction coded data, or other parity-type data)ExaminersPrimary: Atkinson, Charles E.Attorney, Agent or FirmInternational ClassG06F 011/20AbstractThe parallel disk drive array data storage subsystem dynamically maps between virtual and physical data storage devices and schedules the writing of data to these devices. The data storage subsystem functions as a conventional large form factor disk drive memory, using an array of redundancy groups, each containing N+M disk drives. The data storage subsystem does not modify data stored in a redundancy group but simply writes the modified data as a new record in available memory space on another redundancy group. The original data is flagged as obsolete. A mapping table is maintained to identify portions of these redundancy groups which contain newly written or modified virtual track instances. These marked virtual track instances are written to backup medium as a background process and the mapping table is updated to clear the flags that identify these virtual track instances as having been modified. | |
