Patent ID: 6851005
Filing Date: 2005-02-01
Classification: G06F

Abstract:
1. A method for managing access to a logical I/O device, said method comprising: communicatively coupling first and second nodes, having respective first and second bus controllers having respective first and second reservation tables, and said logical I/O device, by means of a bus and said first and second bus controllers; receiving on said first controller a request to reserve said logical I/O device; updating the first reservation table to reflect reservation of the logical I/O device; communicating by means of said bus from said first to said second controller a reservation request for said logical I/O device for updating by said second controller of said second reservation table, in response to said receiving; receiving a response to said communicated reservation request; aborting the method for managing access when said response indicates failure to reserve and said first controller is subordinate to said second controller; otherwise, delaying and communicating again a reservation request for said logical I/O device when said response indicates failure to reserve and said first controller is dominant to said second controller; and otherwise, responding, indicating success, to said received reservation request.