Patent ID: 9348516
Filing Date: 2016-05-24
CPC Classification: G06F

Claim Text:
1. A storage controller that controls a first storage unit and a second storage unit that has an access speed higher than an access speed of the first storage unit, the storage controller comprising: a collector that collects load information about respective loads in a plurality of areas in the first storage unit; a selector that selects a candidate area in the first storage unit which is to be migrated, based on the load information collected by the collector; and a migrator that migrates data in the selected candidate area, to the second storage unit, wherein the selector selects the candidate area based on an average life expectancy, the average life expectancy being calculated by subtracting an actual elapse time of a load during which that load has lasted, in each of the plurality of areas in the first storage unit, from an expected duration time of that load during which that load is expected to last.