Demoting tracks from a first cache to a second cache by using a stride number ordering of strides in the second cache to consolidate strides in the second cache
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United States of America Patent
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Sep 2, 2014
Grant Date -
Jul 18, 2013
app pub date -
Jan 17, 2012
filing date -
Jan 17, 2012
priority date (Note) -
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status (Latency Note)
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Abstract
Information on strides configured in the second cache includes information indicating a number of valid tracks in the strides, wherein a stride has at least one of valid tracks and free tracks not including valid data. A determination is made of tracks to demote from the first cache. A first stride is formed including the determined tracks to demote. The tracks from the first stride are added to a second stride in the second cache that has no valid tracks. A target stride in the second cache is selected based on a stride most recently used to consolidate strides from at least two strides into one stride. Data from the valid tracks is copied from at least two source strides in the second cache to the target stride.
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