Patent ID: 8006123

Claim:
A computer system coupled to a host computer, the computer system comprising: a storage device including a real volume; and a virtualization switch coupled to the host computer and the storage device through a fiber channel, the virtualization switch managing a virtual volume, which is related to the real volume in the storage device, so as to provide the virtual volume to the host computer, and transferring data from the host computer to the storage device, wherein the virtualization switch is adapted to detect an access error to the real volume in the storage device through the fiber channel, wherein the virtualization switch is adapted to receive a message of a first hardware failure, which occurred in a part of a first hardware of the storage device, from the storage device, wherein the virtualization switch is adapted to associate the detected first access error with the received first hardware failure, in response to detection of the access error, and wherein the virtualization switch outputs a failure message which includes information associating the detected first access error with the received first hardware error.