Patent ID: 7600092

Claim:
In a computer system including a first storage device including a data volume storing data and a first resource, related to the data volume, that has been assigned for temporarily holding data related to the data volume which is provided to a host computer, and a virtualization device including a virtual volume related to the data volume and a second resource, related to the virtual volume, for holding data, a resource assigning method comprising the steps of: setting, in the virtualization device, an amount of resource corresponding to an amount of resource which has been assigned to the related data volume of the first storage device, the setting including: obtaining an amount of resource in the first resource which has been assigned to the data volume, referencing correspondence between the data volume and the virtual volume, determining whether or not a resource, related to the virtual volume, for temporarily storing data can be assigned to the virtual volume related to the data volume, wherein the amount of resource to be assigned is an amount based on an amount of resource which has been assigned to the related data volume, and if a resource, related to the virtual volume, can be assigned to the virtual volume having the amount corresponding to the amount of resource which has been assigned to the related data volume, assigning the resource of the virtualization device to the virtual volume according to the amount of resource which has been assigned to the first resource.