Abstract: A method, according to one embodiment, includes obtaining a list having entries corresponding to components of a first system. Moreover, the method includes determining whether an entry is missing from the list, by inserting a pseudo entry to the list for each entry that is determined to be missing from the list, thereby creating an updated list. Once the updated list is created, the method includes sending the updated list to a second system, whereupon the pseudo entries are removed from the updated list. Removing the pseudo entries thereby creates a cloned list having the same identifiers as the entries in the list from the first system.

Abstract: A method for controlling processor access to input/output control units and devices connected to the control units to prevent control unit and device lookout due to the condition where the channel turn-around time becomes less than the device controller's housekeeping time is disclosed. The problem of control unit and device lockout is overcome by monitoring path and device activity for a given processor while at the same time keeping track of other processors waiting for a given path and device. When it is determined that a given number of consecutive input/output operations have been accomplished for a given processor and at the same time another processor requires this resource, then a busy condition will be asserted for new input/output requests from the current processor for the currently accessed path and/or device. This action forces the offending processor to wait until the controller and/or the device is again available.