Digital data storage system with improved data migration
Patent 5276867 Issued on January 4, 1994. Estimated Expiration Date: 
January 4, 2011. 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.
January 4, 2011. 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 References 3806888 Method and apparatus for managing data movements from a backing store to a caching buffer store Managing data storage devices connected to a digital computer Staging method and system in electronic file apparatus Allocating data storage space of peripheral data storage devices using implied allocation based on user parameters Fault tolerant computer backup system Backup computer program for networks Patent #: 5133065 Inventors
AssigneeApplicationNo. 454066 filed on 12/19/1989US Classes:707/204, Archiving or backup711/112, Direct access storage device (DASD)711/117, Hierarchical memories711/162BackupExaminersPrimary: Kulik, Paul V.Attorney, Agent or FirmForeign Patent References
International ClassesG06F 012/00G06F 015/40 AbstractA digital data storage apparatus has primary, secondary and backing storage elements characterized by respectively longer access times. A level detector signals when the quantity of data in the secondary store exceeds a threshold amount. A data migrator responds by moving selected data files from the secondary store to the backing store. The apparatus also includes a baseline back-up element that stores archive copies of a set of selected data files. A full back-up element stores archive copies of those files that, (1) were originally copied to the baseline back-up set but have since changed, or (2) are not otherwise within the baseline back-up set. For those files which were originally copied to the baseline back-up set and which have not changed, the full back-up element stores pointers indicating locations of the respective files in the baseline back-up set.Other References
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