Patent ID: 6470419
Filing Date: 2002-10-22
Classification: G06F

Abstract:
A cache controlling apparatus for controlling a cache operation of a storage system which is composed of a plurality of cache modules connected to each other, and storage modules each of which are connected to each of the cache modules and store information, comprising:a managing unit storing management data for uniformly managing information which belongs to a storage module connected to a first cache module of the plurality of the cache modules, the managed information being distributed to and stored in the first cache module and a second cache module of the plurality of the cache modules based upon access times for each part of the managed information, the management data including data for managing a part of the managed information stored in the first cache module and data for managing a part of the managed information stored in the second cache module, and causing the first cache module to check a location of a part of the managed information by using the management data; a transferring-out unit transferring out a target part of the managed information from the first cache module to the second cache module; and a transferring-in unit transferring the target part of the managed information from the second cache module into the first cache module when the target part of the managed information is found to be in the second cache module according to the management data.