Storage apparatus, storage controller and method for relocating data in solid state drive

摘要

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.

主权项

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.