Storage subsystem and storage system including storage subsystem

摘要

To provide a storage subsystem in which, even when plural types of storage devices are provided, write processing from a cache memory to the plural types of storage devices is not delayed. Even when there are relative merits in writing performance of write data from the cache memory to the HDD and the SSD, the cache memories 13A, 13B with respect to the SSD having low writing performance are provided independently of the cache memories 12A, 12B with respect to the HDD.