Patent ID: 9104554
Filing Date: 2015-08-11
Classification: G06F

Abstract:
1. A storage apparatus comprising: a first solid state drive; and a storage controller configured to control the first solid state drive, wherein the storage controller comprises a logical unit management unit configured to define a logical unit including a logical area to which a physical area of the first solid state drive is allocated, an access statistic collection unit configured to collect write frequencies of a plurality of logical address areas having a predetermined size which configure the logical area of the logical unit, a selection unit configured to select, based on the write frequencies, a set of first logical address areas having low write frequencies and a set of second logical address areas excluding the set of the first logical address areas, respectively from the logical unit, and a rewrite unit configured to execute first rewriting for collectively rewriting data of the set of the first logical address areas to the first solid state drive, and second rewriting for collectively rewriting data of the set of the second logical address areas to the first solid state drive.