Patent ID: 9563574
Date: 2017-02-07
CPC Classifications: G06F

Claim:
1. A storage control device connected to a host computer, comprising: a communication unit that receives a command, to which a priority is set, from the host computer; a command executing unit that executes the command received from the communication unit according to the priority; a cache memory that is used by the command executing unit; a cache controller that manages slots of the cache memory; and a plurality of storage devices that stores data used by the host computer, including a high speed storage device whose response speed is high and a low speed storage device whose response speed is low, wherein the cache controller sets the priority to a slot that stores target data of the command and controls the data to allocate slots for each priority by using a target slot count that is set for each priority as a target value, so that data whose priority is high stay in the cache memory a long time, and distributes the target slot count that is set for each priority to the high speed storage device and the low speed storage device inversely proportional to the response speed.