Patent ID: 7149860

Claim:
A system comprising: a first storage system that includes a first storage and a first control apparatus for controlling the first storage; and a second storage system that includes a second storage and a second control apparatus for controlling the second storage, wherein the first storage system and the second storage system are connected, each of the first storage and the second storage includes a volume to which one of an attribute to the effect that data can be referred to and can be updated and an attribute to the effect that data can be referred to but cannot be updated is added, the first control apparatus receives designation of a primary volume, the second control apparatus receives designation of a secondary volume in which a copy of data to be stored in the primary volume is stored, and the first control apparatus judges whether the attribute to the effect that data can be referred to and can be updated or the attribute to the effect that data can be referred to but cannot be updated is added to the volume designated as the primary volume, and if the volume designated as the primary volume is a volume to which the attribute to the effect that data can be referred to but cannot be updated is added, the first control apparatus instructs the second control apparatus to add the attribute to the effect that data can be referred to but cannot be updated to the volume designated as the secondary volume.