Patent ID: 7475217

Claim:
A capacity management method of managing a capacity of a disk apparatus of each storage device in a computer system having a plurality of storage devices, each having at least one disk apparatus which each comprise one or more storage areas, comprising the steps of: judging whether or not there is a storage area relation between a first storage area in a first storage device of said plurality of storage devices and a second storage area in a second storage device of said plurality of storage devices; if there is the storage area relation between the first storage area and the second storage area, calculating an estimated capacity for the at least one disk apparatus comprising the first storage area based on a used capacity of the at least one disk apparatus comprising the second storage area, and displaying the estimated capacity on a display device of the computer system, wherein, the storage area relation is a remote copy or replication relation between the first storage area and the second storage area in which a replica of data stored in the second storage area is stored in the first storage area in response to a request from a computer so that the estimated capacity of the first storage area is adjusted based on the used capacity of the second storage area that will be copied or replicated to the first storage area; and wherein the computer system further includes a third storage area in the first storage device, which third storage area does not have a storage area relation of a remote copy or replication with the second storage area, and wherein a slope of an estimation equation for calculating estimated capacity of said third storage area differs from a slope of an estimation equation for calculating the estimated capacity of said first storage area based on the used capacity of said second storage area.