Redundant array parity caching system
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United States of America Patent
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Aug 23, 1994
Grant Date -
N/A
app pub date -
Jan 21, 1992
filing date -
Jan 21, 1992
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An apparatus and method for improving the input/output performance of a redundant storage array system. The present invention provides a 'special parity' cache within the controller for a redundant storage array system, and means for determining and caching a quantity known as the 'remaining redundancy row parity' (RRR-parity) block. The RRR-parity block is equal to the old parity block of a redundancy row XOR'd with an old data block being read from the same redundancy row. By caching RRR-parity blocks, Write-intensive storage unit operations can be reduced by up to three input/output accesses.
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