Fast write operations
August 31, 2007. 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 3588839 Memory hierarchy system with journaling and copy back Cache/disk system with writeback regulation relative to use of cache memory Cache/disk subsystem with floating entry Hierarchical memory system with variable regulation and priority of writeback from cache memory to bulk memory Cache/disk subsystem with file number for recovery of cached data Processing system tolerant of loss of access to secondary storage Peripheral subsystem initialization method and apparatus Patent #: 4779189 Inventors
ApplicationNo. 091406 filed on 08/31/1987US Classes:711/162, Backup701/18, Profile of descent711/118, Caching711/156, Status storage714/1Reliability and availabilityExaminersPrimary: Clark, David L.Assistant: Jaffe, Michael A. Attorney, Agent or FirmInternational ClassG06F 013/00AbstractA technique is described for performing a fast write operation. A host write request, which would normally be serviced by an immediate physical write to a data storage device, is instead written to cache and nonvolatile storage in the data storage device controller. Then, the controller signals the host that the write operation is complete and does not update the physical data storage device until later. A journal log is also used to provide recovery capability in the event of system failure. This technique provides high performance for the units' operation while assuring integrity by keeping two copies of the write operation until the physical update transpires.Other References
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