Disk control unit and disk control method
Patent 6347358 Issued on February 12, 2002. Estimated Expiration Date: 
December 15, 2019. 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.
December 15, 2019. 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 ReferencesMethod and apparatus for transferring data between two devices with reduced microprocessor overhead Method and system for dynamic cache allocation between record and track entries Method and apparatus for controlling the contents of a cache memory Method for accelerating disk array write operations using segmented cache memory and data logging Patent #: 6148368 InventorAssigneeApplicationNo. 460979 filed on 12/15/1999US Classes:711/113, Caching711/114, Arrayed (e.g., RAIDs)711/129Partitioned cacheExaminersPrimary: Kim, MatthewAssistant: Tran, Denise Attorney, Agent or FirmForeign Patent References
International ClassG06F 013/14Foreign Application Priority Data1998-12-22 JPAbstractThe present invention discloses a disk control unit which improves the use of a cache in a disk unit to increase concurrent access speeds. The disk control unit comprises a plurality of directors each independently controlling an I/O operation between a plurality of hosts and a disk unit, a cache memory connected to the directors and having a plurality of cache areas provided according to the configuration of the disk unit, and a plurality of cache management areas each provided for each of the cache areas for keeping track of whether or not the cache area is used by any of the directors. In addition, the disk control unit has an exclusive control unit which allows each director to reference the cache management area to place the cache area under exclusive control. | |
