International Business Machines Corporation

S Michael Benson

Harry M Yudenfriend

Jeffrey Douglas Haggar

Richard Cwiakala

Mark J Fantacone

Dennis D Koren

Alan S Meritt

Michael Schulte

Allan S Merritt

An installation creates a source I/O definition file (IODF), defining a current system I/O configuration, and a target IODF, defining a future I/O configuration. An activate function is initiated to change the system's hardware and software definition to correspond to the target IODF. A compare function compares the source and target IODFs, and creates a Configuration Change Block (CCB) to efficiently drive the change process. A validation function validates that the proposed change is valid, and the change process updates the hardware and software configuration definitions. If the change process is successful, a notification is sent; if not, a back-out process restores the I/O configuration to its initial state.

System for dynamically changing a system I/O configuration by

An installation creates a source I/O definition file (IODF), defining a current system I/O configuration, and a target IODF, defining a future I/O configuration. When the configuration definition is dynamically changed from the current to the target, a serialization mechanism--comprising a 'device pin' technique and a 'group serialization' technique to handle changed device group definitions--insures that data integrity is not lost on devices undergoing reconfiguration; and a change detection mechanism insures that changes to control structures affected by the dynamic reconfiguration, are noticed by programs accessing those control structures while the structures are changing.

Method and system for managing an operating system definition of a

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Highland, NY, United States of America

S Michael Benson