Data and parity prefetching for redundant arrays of disk drives
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United States of America Patent
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May 3, 1994
Grant Date -
N/A
app pub date -
Aug 12, 1992
filing date -
Aug 12, 1992
priority date (Note) -
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Abstract
A method for prefetching the data and parity blocks for generating parity data of a stripe. The method uses a low and high thresholds marker indicative of a first and second level of fullness of the cache to determine whether or not to prefetch the data and parity blocks. If the cache is filled to a level exceeding the first level of fullness, the data and parity blocks are prefetched for any blocks to be written to the disk drive between the low and high threshold. The data and parity blocks are read from the disk drive at a lower processing priority in anticipation of the writing of the block.
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