Patent ID: 7933993

Claim:
A server environment comprising: a first server having a first host-bus adapter with a first physical port and a first registry for storing a virtual-port identity of a relocatable virtual port in association with said first physical port so that a program running on said first server can access external storage via said first physical port by accessing said relocatable virtual port; a second server having a second host-bus adapter with a second physical port and a second registry; a migration manager for migrating said program from said first server to said second server and said virtual port identity from said first registry to said second registry so that said program running on said second server can access external storage via said second physical port by accessing said relocatable virtual port; and said program, is a virtual server and said relocatable virtual port provides exclusive access to a logical unit of said external storage so that no other virtual server running on said servers can access said logical unit without using said relocatable virtual port.