Storage apparatus, storage controller and method for relocating data in solid state drive
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United States of America Patent
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Aug 11, 2015
Grant Date -
Sep 25, 2014
app pub date -
Mar 22, 2013
filing date -
Sep 25, 2012
priority date (Note) -
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Abstract
According to one embodiment, a storage controller comprises an access statistic collection unit, a selection unit and a rewrite unit. The access statistic collection unit collects write frequencies of a plurality of small logical address areas having a predetermined size which configure a logical area of a logical unit defined using a solid state drive. The selection unit selects a set of first small logical address areas having low write frequencies from the logical unit. The rewrite unit collectively rewrites data of the set of the first small logical address areas to the solid state drive, and collectively rewrites data of a set of remaining second small logical address areas to the solid state drive.
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