Patent ID: 7475213

Claim:
A storage control system in which a first storage controller is connected to a storage device in a second storage controller and the first storage controller is configured to be able to read and write data from/to the storage device in the second storage controller in response to a request from a host device connected to the first storage apparatus, the first storage controller comprising: a controller for controlling data transmission and reception between the host device and the storage device in the second storage controller; and a cache memory for temporarily storing the data, wherein the controller sets a threshold value for storage capacity in the cache memory assigned to the storage device according to at least one of: the class of a storage control speed of the second storage controller, a version of a controller in the second storage controller, and a storage capacity of a cache memory in the second storage controller; wherein the controller limits its access to the cache memory based on the usage state of the storage device; wherein the controller reduces the threshold value when a specific failure occurs in the storage device at a specific frequency; and wherein the controller determines a value subtracted from the threshold value based on the alternate path structure type in the storage device and the redundancy of the alternate paths.