Instantaneous restoration of a production copy from a snapshot copy in a data storage system
Patent 6957362 Issued on October 18, 2005. Estimated Expiration Date: August 6, 2022. 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.
714/20, Plural recovery data sets containing set interrelation data (e.g., time values or log record numbers)714/15, State recovery (i.e., process or data file)714/5, Of memory or peripheral subsystem714/7, Reconfiguration (e.g., adding a replacement storage component)711/118, Caching707/203, Version management711/162, Backup711/168, Concurrent accessing714/21, State validity check707/200, FILE OR DATABASE MAINTENANCE707/204, Archiving or backup714/19, Undo record711/154, Control technique711/202, Address mapping (e.g., conversion, translation)711/114, Arrayed (e.g., RAIDs)714/6Redundant stored data accessed (e.g., duplicated data, error correction coded data, or other parity-type data)
A data storage system maintains a production dataset supported by a clone volume, and multiple snapshot datasets supported by respective save volumes in a snapshot queue. In order to instantaneously restore the production dataset with the state of any specified snapshot, the data storage system responds to requests for read/write access to the production dataset by reading from the specified snapshot dataset and writing to the production dataset. The data storage system keeps a record of data blocks that have been modified by writing to the production dataset. The data storage system initiates a process of copying data blocks from the specified snapshot dataset to the production dataset if the record of the data blocks indicates that the data blocks have not yet been modified by writing to the production dataset.
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August 6, 2022. 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.
