Patent ID: 7366835

Claim:
A data access responding system, comprising: a storage apparatus storing data; a cache apparatus which acts as a cache for the data stored in said storage apparatus; a client apparatus processing the data; and a control apparatus managing storage locations of the data in said storage apparatus and in said cache apparatus, which are connected via a communication network, wherein said control apparatus provides a transfer instruction to one of said storage apparatus and said cache apparatus, in which one the relevant data is stored, when receiving an access request from said client apparatus for the data; and said one of said storage apparatus and said cache apparatus receiving said transfer instruction directly returns to said client apparatus a reply message accompanied by information of the storage location of the relevant data, wherein said one of said storage apparatus and said cache apparatus in which the relevant data is stored comprises said cache apparatus; and said client apparatus has a memory storing said information of the storage location, wherein said client apparatus directly accesses said cache apparatus when making an access request for the data for which the information of the storage location is stored in said memory, without making an access request to said control apparatus, and has the data transferred thereto from said cache apparatus, wherein said client apparatus is prevented from directly accessing said cache apparatus for the data, as a result of the information of the storage location of the data being changed, and wherein said client apparatus deletes the information of the storage location from said memory and makes access request to said control apparatus, when direct access to said cache apparatus is not allowed.