Apparatus, system, and method for destaging cached data
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United States of America Patent
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Dec 13, 2016
Grant Date -
May 17, 2012
app pub date -
Jan 24, 2012
filing date -
Dec 6, 2007
priority date (Note) -
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Abstract
An apparatus, system, and method are disclosed for satisfying storage requests while destaging cached data. A monitor module samples a destage rate for a nonvolatile solid-state cache, a total cache write rate for the cache, and a dirtied data rate. The dirtied data rate comprises a rate at which write operations increase an amount of dirty data in the cache. A target module determines a target cache write rate for the cache based on the destage rate, the total cache write rate, and the dirtied data rate to target a destage write ratio. The destage write ratio comprises a predetermined ratio between the dirtied data rate and the destage rate. A rate enforcement module enforces the target cache write rate such that the total cache write rate satisfies the target cache write rate.
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