Patent ID: 7246208

Claim:
A storage subsystem, comprising: a plurality of channel adapters that each controls the exchange of data with a host device; a plurality of storage device groups that each provides a logical storage region; a plurality of disk adapters that each controls the exchange of data with each of the storage device groups; a cache memory that is used by each of the channel adapters and each of the disk adapters; a plurality of cache partition regions constituted by logically partitioning the cache memory; and a control memory that stores management information for managing each of the cache partition regions, wherein the management information is constituted by both a plurality of partition management information that is used to independently manage corresponding ones of the cache partition regions, and common management information that is used to commonly manage a plurality of the cache partition regions, wherein the management information is constituted by submanagement information of a plurality of types, and wherein the partition management information is constituted by partitioning, based on an indication of a kind of status in which data is stored in an area of the cache partition region, some of the submanagement information items for each of the cache partition regions, the remainder of the submanagement information being used as the common management information.