Patent ID: 8291184

Claim:
A copy control apparatus for controlling a copy process between disks, the apparatus comprising: a copy process execution unit that executes the copy process between disks by securing a storage area on a cache; a data capacity measuring unit that measures a data capacity contained in a write request accepted from a host system during execution of the copy process between disks by the copy process execution unit; and a changing unit that changes a capacity of the storage area secured by the copy process execution unit in accordance with the data capacity measured by the data capacity measuring unit, wherein the copy process execution unit secures, on the cache, a storage area capacity corresponding to a number of sessions established between the disks in the same time period, and executes the copy process between disks using the secured storage area, and the changing unit, upon judgment that a data accumulation value indicating an amount of data accumulated in the cache is not less than a predetermined threshold value based on a result of measuring the data capacity by the data capacity measuring unit, changes the number of the currently established sessions to one and changes the capacity of the storage area secured by the copy process execution unit.