Patent ID: 7865687

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