Patent ID: 8732428

Claim:
A computer system comprising a first storage apparatus, wherein the first storage apparatus includes: a port for external connection with a second storage apparatus; a virtual volume to which a volume in the second storage apparatus is mapped; a memory storing a command group for setting the volume to the second storage apparatus; and a controller for storing write data in the volume in response to a write request from a host to the virtual volume and fetching read data from the volume in response to a read request from the host to the virtual volume; and wherein the controller judges whether a volume creation request to the first storage apparatus is either a request to create a volume in the first storage apparatus or a request to create a volume in the second storage apparatus; if it is determined that the volume creation request is the request to create a volume in the second storage apparatus, the controller sends the command group to the second storage apparatus; and after receiving information about the volume, which has been set, from the second storage apparatus, the controller stores the information about the volume in the memory, wherein the first storage apparatus has a port for receiving management information from a management device, the management device classifies the first storage apparatus and the second storage apparatus into a plurality of storage groups and sends management information about the classification to the port, the memory stores identification information about each of the plurality of storage groups, and the controller performs the judgment on the volume creation request based on the identification information contained in the volume creation request.