Periodic destages from inside and outside diameters of disks to improve read response time via traversal of a spatial ordering of tracks
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United States of America Patent
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Sep 16, 2014
Grant Date -
May 23, 2013
app pub date -
Nov 17, 2011
filing date -
Nov 17, 2011
priority date (Note) -
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status (Latency Note)
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Abstract
A storage controller that includes a cache, receives a command from a host, wherein a set of criteria corresponding to read response times for executing the command have to be satisfied. A destage application that destages tracks based at least on recency of usage and spatial location of the tracks is executed, wherein a spatial ordering of the tracks is maintained in a data structure, and the destage application traverses the spatial ordering of the tracks. Tracks are destaged from at least inside or outside diameters of disks at periodic intervals, while traversing the spatial ordering of the tracks, wherein the set of criteria corresponding to the read response times for executing the command are satisfied.
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