Patent ID: 9727247
Date: 2017-08-08
CPC Classifications: G06F

Claim:
1. A storage device comprising: a first storage device including a data writable and readable first storage unit; a second storage device including a data writable and readable second storage unit, the first storage device being not slower than the second storage device, the first storage device further including a first storage area for storing management information for access control and management of the second storage unit, and the second storage device further including a second storage area for storing management information for access control and management of the second storage unit; the storage device further comprising circuitry configured to: variably set an allocation between a capacity of the first storage unit and a capacity of the first storage area in the first storage device, wherein the circuitry is further configured to: calculate an allocation between a capacity of the first storage unit required to hit an access target in the first storage unit and a capacity of the first storage area required to hit, in the first storage area, the management information relating to the second storage unit; record hit frequency information for each predetermined capacity for the first storage unit and the first storage area; and determine a capacity allocation optimum in terms of shortening an access time, based on the hit frequency information, for a combination of capacity allocation shares between the first storage unit and the first storage area.