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Method and means for encoding and rebuilding data contents of up to two unavailable DASDs in an array of DASDs
Method and means for encoding and rebuilding data contents of up to two unavailable DASDs in an array of DASDs
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机译:用于在一组DASD中编码和重建最多两个不可用DASD的数据内容的方法和手段
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摘要
A method and means for encoding data written onto an array of M synchronous DASDs and for rebuilding onto spare DASD array capacity when up to two array DASD fail. Data is mapped into the DASD array using an (M- 1)*M data array as the storage model where M is a prime number. Pairs of simple parities are recursively encoded over data in respective diagonal major and intersecting row major order array directions. The encoding traverse covering a topologically cylindrical path. Rebuilding data upon unavailability of no more than two DASDs merely requires accessing the data array and repeating the encoding step where the diagonals are oppositely sloped and writing the rebuilt array back to onto M DASDs inclusive of the spare capacity.
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