International Business Machines Corporation

Ugochukwu Njoku-Charles

Harry M Yudenfriend

Thomas Anthony Gregg

Charles W Gainey, Jr

David F Craddock

Dale Francis Riedy, Jr

Jeffrey Paul Kubala

Gustav E Sittmann, Iii

Kenneth J Oakes

Peter Kenneth Szwed

Leslie W Wyman

Beth A Glendening

Frank William Brice

Tan Lu

Charles E Shapley

Janet R Easton

Eugene P Hefferon

Marten J Halma

Carol B Hernandez

Hans-Helge Lehmann

Charles Gainey Jr

Anthony Coneski

Charles Gainey

Input/output (I/O) communications subadapters, such as subchannels, of an I/O subsystem are dedicated to components, such as I/O devices, of the I/O subsystem. The subadapters provide information about the associated components, in response to the execution of I/O instructions. To enhance I/O connectivity, a plurality of sets of I/O subadapters is provided to an operating system image. This allows programs of the operating system image to access a same component via different sets of I/O communications subadapters. Further, it enables an operating system image to use more than 64 k subchannels.

Managing sets of input/output communications subadapters of an input/output subsystem

An input/output subsystem is configured as a plurality of input/output subsystem images, each of which appears to a program as an independent input/output subsystem. One or more input/output subsystem images of the plurality of input/output subsystem images are managed. An aspect of this management includes managing an input/output (I/O) configuration of an input/output subsystem image. This management may be performed dynamically.

Managing configurations of input/output system images of an input/output subsystem, wherein a configuration is modified without restarting the input/output subsystem to effect a modification

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