Patent ID: 7934071

Claim:
A management computer comprising: an interface connected via a first network to a plurality of storage devices each having at least one disk apparatus which each have a plurality of storage units; and a processor, wherein, in accordance with a judgment that there is a plurality of storage units relation between a first plurality of storage units of a first storage device of said plurality of storage devices and a second plurality of storage units of a second storage device of said plurality of storage devices connected via a second network to said first storage device, said processor calculates an estimated capacity for the at least one disk apparatus comprising the first storage device based on a used capacity of the at least one disk apparatus comprising the second storage device, wherein, the relation is a remote copy or replication relation between the first plurality of storage units and the second plurality of storage units in which a replica of data stored in the second plurality of storage units are stored in the first plurality of storage units in response to a request from a computer so that the estimated capacity of the first plurality of storage units is adjusted based on the used capacity of the second plurality of storage units—that will be copied or replicated to the first plurality of storage units, and further comprising a third plurality of storage units in the first storage device, which third plurality of storage units does not have a plurality of storage units-relation of a remote copy or replication with the second plurality of storage units, and wherein a slope of an estimation equation for calculating estimated capacity of said third plurality of storage units differs from a slope of an estimation equation for calculating the estimated capacity of said first plurality of storage units—on the used capacity of said second plurality of storage units.