Patent ID: 7260634

Claim:
A network system connected to a storage device and a plurality of information devices using storage regions of the storage device which includes at least one network port and at least one disk volume, the storage device being connected to the network system via the at least one network port, the network system comprising a band control instruction apparatus including: a band control information creation unit for creating band control information for performing network communication band control of a communication path between an information device and a network port of the storage device in accordance with band guarantee requirement information indicating a communication condition to be guaranteed on the communication path, configuration information indicating a connection between the network port and a disk volume in the storage device and indicating a connection between the information device and the disk volume, and performance information of the network port and the disk volume in the storage device, and an instruction unit for instructing a band control execution device, coupled between the information device and the storage device in the network system, to execute the network communication band control of the communication path in accordance with the band control information received from the band control information creation unit, wherein the band control information creation unit judges whether the band control information created by the band control information creation unit causes the guaranteed communication condition to be satisfied by comparing information including the configuration information and the performance information to the band guarantee requirement information, and wherein if the band control information created by the band control information creation unit does not cause the guaranteed communication condition to be satisfied, the band control information is changed by re-creating new band control information by the band control information creation unit.