Method and means for managing RAID 5 DASD arrays having RAID DASD arrays as logical devices thereof
Patent 5301297 Issued on April 5, 1994. Estimated Expiration Date: 
July 3, 2011. 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.
July 3, 2011. 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 recovering data stored in failed memory unit Single-reflex camera driven by motor Method and means for accessing DASD arrays with tuned data transfer rate and concurrency Method and means for encoding and rebuilding data contents of up to two unavailable DASDs in an array of DASDs Patent #: 5271012 InventorsAssigneeApplicationNo. 725696 filed on 07/03/1991US Classes:711/114Arrayed (e.g., RAIDs)ExaminersPrimary: Kulik, Paul V.Attorney, Agent or FirmInternational ClassG06F 012/06AbstractA method and apparatus teaching insertion of addressing indirection to form and to access an array hierarchy expressly permitting the concurrency of a high level RAID array, the bandwidth and degraded mode operation sustainable by a lower level RAID array, and after a DASD failure minimum spanning involvement when the array is rebuilding and rewriting missing data to a spare logical device. Also, disclosed are the accessing of variable length records on the array hierarchy; array hierarchy in which RAID 5 arrays have dissimilar number of logic devices (lower level RAID arrays) and interleave depths; formation of logical arrays using fractional storage defined onto real DASD subsets; and the defining of logical devices onto DASDs distributed in the same or different physical clusters of DASDs and the rebuild operation thereof.Other References
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