Computer data storage physical backup and logical restore
Patent 6366987 Issued on April 2, 2002. Estimated Expiration Date: August 13, 2018. 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.
A data storage system is constructed to rapidly respond to a physical backup request for backup of a physical storage unit such as a disk volume or cylinder. A user, however, may request backup of a logical data structure such as a file having a rather complex mapping to a number of physical storage components such as a number of disk tracks. For backup and restore of such a logical data structure, a backup agent requests an application interface routine to backup a physical storage unit that includes the logical data structure. The application interface routine issues a corresponding physical backup request to the data storage system, and creates a catalog of information about content of the physical storage unit that would be needed for restoring the logical data structure from the backup version of the physical storage unit. Later, if and when the backup agent requests the restoration of the logical data structure, the application interface routine looks up the logical data structure in the catalog, issues a physical restore request to the data storage system to retrieve a backup version of the physical storage unit from backup data storage and load it into spare data storage, extracts the logical data structure from the physical storage unit in the spare data storage by performing a logical-to-physical translation, and restores the logical data structure into the current version of data storage.
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August 13, 2018. 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.
