Patent ID: 6970972

Claim:
A disk control device comprising: a plurality of host interface modules configured to interface with a computer; a plurality of disk interface modules configured to interface with a storage device; a plurality of cache memory modules configured to temporarily store data read from or written to the storage device; and a switch network connecting the host interface modules, the cache memory modules, and the disk interface modules, the switch network comprising at least one switch; wherein each of the host interface modules is configured to execute data transfers between the computer and the cache memory modules, and each of the disk interface modules is configured to execute data transfers between the storage device and the cache memory modules; wherein each of the host interface modules, the disk interface modules, and the cache memory modules includes identification information providing unique identification within the switch network; wherein the switch network includes a memory containing path information based on the identification information for data transfer paths among the host interface modules, the disk interface modules, and the cache memory modules; and wherein each of the cache memory modules is configured to monitor failure in the cache memory module and to control changing of the path information relating to the cache memory module in the memory of the switch network.