Hard disk drive with attached solid state drive cache
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United States of America Patent
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Feb 4, 2014
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N/A
app pub date -
Apr 24, 2012
filing date -
Feb 19, 2009
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Abstract
Methods, systems, and computer programs for managing storage using a solid state drive (SSD) read cache memory are presented. One method includes an operation for determining whether data corresponding to a read request is available in a SSD memory when the read request causes a miss in a memory cache. The read request is served from the SSD memory when the data is available in the SSD memory, and when the data is not available in the SSD memory, SSD memory tracking logic is invoked and the read request is served from a hard disk drive. Invoking the SSD memory tracking logic includes determining whether a fetch criteria for the data has been met, and loading the data corresponding to the read request in the SSD memory when the fetch criteria has been met. The use of the SSD as a read cache improves memory performance for random data reads.
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