Patent ID: 7447708

Claim:
A network system comprising: one or a plurality of storage apparatuses each of which is coupled to a disk device; and a computer coupled to each of said one or a plurality of storage apparatuses, wherein said computer stores first quality of service (QoS) information of at least one of said one or plurality of storage apparatuses, said first QoS information being lower level QoS information such as information on performance of said one or plurality of storage apparatuses, and wherein when said computer receives a request including second QoS information, said computer translates the second QoS information, which is higher level QoS information such as information of properties of a file for a user, into the first QoS information, selects one of the one or plurality of storage apparatuses based on the translated first QoS information and the stored first QoS information, and outputs an instruction to the selected one or plurality of storage apparatuses.