NETWORK STORAGE SYSTEM, METHOD, CLIENT DEVICE, CACHE DEVICE, MANAGEMENT SERVER AND PROGRAM

摘要

PROBLEM TO BE SOLVED: To provide a technique which enables improving sensible speed of a user when writing data in a network storage service.SOLUTION: A network storage system installs at least one master server for storing data to control access permission/rejection for the data, a plurality of cache devices transmitting the data which has been at least temporarily held to the master server to store it therein, and a management server having a means for managing log-in from a user who has subscribed to a storage service. A client device transmits a request for log-in to the management server to receive information specifying a cache device selected for the client device of a request source together with a success response of the log-in, transmits a request for writing data into the cache device, receives the permission to the request for writing which has been relayed from the cache device to the master server, and transmits the data to the cache device to hold it therein.