Fast virtual device in a computer system transfer system and a management apparatus and its method and program

In virtualized computer system in which at least two or more computers connected via a network, to shorten the service downtime encountered when dynamically move the virtual device to the second computer from the first computer. Upon movement of the virtual device from the first physical unit to the second physical unit, a memory data existing in the mapped region in the main storage means a first physical unit has, available at first physical unit mapped to a high speed memory device that is set with, and second in the physical device is registered but copied to the set unavailable area, accessible-not fast storage during the pause of the virtual device virtual device using the arithmetic processing unit ownership information of the first physical unit ownership replacement processing second physical device by performing that from the second physical unit reset to soluble disables from about There dynamically configure it to operate.