Patent ID: 8856264

Claim:
A computer system comprising: a plurality of host computers in which a plurality of host programs are executed; a plurality of storage systems including a plurality of volumes provided to the plurality of host programs; a plurality of storage systems including a plurality of resource pools provided by storage areas on the plurality of storage systems; and a management system, wherein: each of the plurality of host programs is located at a port of a host computer; each of the plurality of volumes is located at one of a plurality of ports of a plurality of storage systems; the plurality of volumes include a first volume located at a first port of a first storage system; a range of a resource pool is managed as a transfer range; the management system is configured to: specify a plurality of candidate ports for new location of the first volume in the plurality of storage systems, specify the plurality of candidate ports from the ports which belong to the same resource pool managed as a transfer range with the first volume and belong to the storage system having a free capacity more than a capacity of the first volume, and obtain information on bandwidths of a plurality of paths included in a data communication network among the plurality of storage systems and the plurality of host computers including information on bandwidths of individual paths between the first port and the candidate ports for new location of the first volume in the plurality of storage systems; the management system further obtains information on the number of connection apparatuses in the individual paths between the first port and the candidate ports for new location and access status of the first volume; the management system determines priority levels of the individual candidate ports with reference to the information on the bandwidths of the individual paths between the first port and the candidate ports for new location and the number of connection apparatuses in the individual paths between the first port and the candidate ports for new location and the access status of the first volume; and the management system presents the determined priority levels.