Patent ID: 7913028

Claim:
A data processing system including a plurality of data relaying devices, a plurality of request control devices connected to each of the data relaying devices, a control device connected to the data relaying devices and the request control devices, and a device under the control of each of the request control devices, wherein the control device includes a configuration information copying unit that, when a new data relaying device not having a configuration information is incorporated in the data processing system, retrieves the configuration information from an existing data relaying device and copies the retrieved configuration information to the new data relaying device; a stop-command issuing unit that issues a stop-request command instructing the request control devices to stop sending a request from the device to the existing data relaying device when the configuration information copying unit completes copying of the configuration information; a start-operations command issuing unit that issues a start-operations command instructing all the data relaying devices to start operating, upon receiving a request completion notification indicating that a previous request received by the existing data relaying devices before the enforcement of the stop-request command have been processed; and a start-command issuing unit that issues a start-request command instructing the request control devices to start sending the request to the data relaying devices, once the start-operations command issuing unit issues the start-operations command, and each of the data relaying devices includes a request completion notifying unit that determines whether the previous request has been processed, upon suspension of sending of the request by the control device, and sends the request completion notification to the control device if the previous request have been processed.