CPU implemented method for backing up modified data sets in non-volatile store for recovery in the event of CPU failure
September 26, 2012. 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 ReferencesSystem for facilitating the copying back of data in disc and tape units of a memory hierarchial system Processor-addressable timestamp for indicating oldest written-to cache entry not copied back to bulk memory Virtual memory recovery system using persistent roots for selective garbage collection and sibling page timestamping for defining checkpoint state Fault-tolerant multiprocessor arrangement Multiprocessor system for updating status information through flip-flopping read version and write version of checkpoint data Method for managing reuse of hard log space by mapping log data during state changes and discarding the log data Fast write operations High-speed, high-capacity, fault-tolerant error-correcting storage system Shadow memory system for storing variable backup blocks in consecutive time periods Fault tolerant computer backup system Patent #: 5089958 InventorsApplicationNo. 385647 filed on 07/25/1989US Classes:714/6, Redundant stored data accessed (e.g., duplicated data, error correction coded data, or other parity-type data)711/162, Backup714/20Plural recovery data sets containing set interrelation data (e.g., time values or log record numbers)ExaminersPrimary: Robertson, David L.Assistant: Kim, Matthew Attorney, Agent or FirmInternational ClassG06F 012/16AbstractA CPU implemented method for managing the backup copying of data sets residing in non-volatile storage and for the recovery thereof in the event of CPU failure. The first step is to invoke a modified incremental backup copy policy using a small backup window and less data than that heretofore used in full, incremental or mixed policies. That is, a backup copy is made to a first designated part of non-volatile storage of only those data sets in a storage group satisfying a pair of adjustable parameters relating the last backup date, the last update, and the current date. The second step occurs during a recovery cycle in the event of CPU failure wherein the backed up datasets are copied from said first designated part into a second designated part of non-volatile storage. | |
