Methods and apparatus for managing cached CRC values in a storage controller
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United States of America Patent
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Aug 3, 2004
Issued Date -
N/A
app pub date -
Jan 24, 2002
filing date -
Dec 17, 2001
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A CRC value cache architecture and methods of operation of same to reduce overhead processing associated with managing a CRC value cache memory. The invention first provides for transferring from system memory to CRC value cache memory all CRC values for all sub-blocks of a data block in response to access to a first CRC value for a first sub-block. This reduces overhead processing to arbitrate for control of the system memory for each CRC value for each sub-block of a block. The invention additionally provides that a separate cache table is maintained corresponding to each device within the storage controller that requests CRC values. Each of the multiple cache entry tables is therefore shorter and more rapidly searched as compared to prior techniques thereby further reducing overhead processing to manage the cached CRC values.
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