Compression on thin provisioned volumes using extent based mapping
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United States of America Patent
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Aug 26, 2014
Grant Date -
Aug 9, 2012
app pub date -
Apr 19, 2012
filing date -
Feb 5, 2010
priority date (Note) -
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Abstract
A set of logical extents, each having compressed logical tracks of data, is mapped to a head physical extent and, if the head physical extent is determined to have been filled, to at least one overflow extent having spatial proximity to the head physical extent. Pursuant to at least one subsequent write operation and destage operation, the at least one subsequent write operation and destage operation determined to be associated with the head physical extent, the write operation is mapped to one of the head physical extent, the at least one overflow extent, and an additional extent having spatial proximity to the at least one overflow extent.
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