Method and apparatus for efficient cache read ahead
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United States of America Patent
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Jan 24, 2017
Grant Date -
Sep 4, 2014
app pub date -
Jul 29, 2013
filing date -
Mar 4, 2013
priority date (Note) -
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Abstract
A method for providing improved sequential read performance in a storage controller is provided. In response to the storage controller receiving a host read request from a host computer, the method includes identifying, by the storage controller, a largest burst length of a plurality of burst lengths in a memory of the storage controller, and determining a maximum number of consecutive times between bursts having a value less than a predetermined value. A burst includes a consecutive group of sequential host read requests from the same host computer. The method also includes multiplying the largest burst length of the plurality of burst lengths by the maximum number of consecutive times between bursts having a value less than the predetermined value to obtain an effective burst length and reading into a storage controller cache memory at least the effective burst length of data from storage devices coupled to the storage controller.
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