Conventionally, when a switch virtualizing a storage (storage virtualization switch) is installed in a computer system including an SAN, a host computer, and a storage device, since a port ID of a virtual storage and a port ID of a storage device assigned to the virtual storage are different, the computer...http://www.google.co.uk/patents/US7159045?utm_source=gb-gplus-sharePatent US7159045 - Address management device
