Abstract: A computing system includes: first and second I/O interfaces that are associated with a server; and an I/O management unit that connects the server with the first and second I/O interfaces. The I/O management unit includes: an I/O buffer; an I/O mapping unit that stores an access request of the server to the first I/O interface in the I/O buffer in response to a change start request of the first I/O interface associated with the server to the second I/O interface; an I/O changing unit that associates the second I/O interface with the server; and an I/O synchronizing unit that converts the access request stored in the I/O buffer into an access request to the second I/O interface, in response to the completion of the association by the I/O changing unit, and executes the converted access request.