International Business Machines Corporation

Paul A Malinowski

Robert Edward Galbraith

Kenneth J Oakes

Leslie W Wyman

Allan Samuel Meritt

Roger E Hough

Marten J Halma

Joseph C Elliott

Martin W Sachs

Kenneth J Fredericks

David E Stucki

David Paul Brelsford

Frank W Brice

Suzanne M John

Peter H Tallman

Margaret Croft Enichen

John C Rathjen, Jr

Gerald Allen Davison

Pamela H Dewey

Roger W Rogers

Lynn A Czak

Sarah T Hartley

Leslie S Coleman

Daniel D Cerutti

Provides a method for increasing the connectivity of I/O resources to a multiplicity of operating systems (OSs) running in different resource partitions of a computer electronic complex (CEC) to obtain sharing of the I/O resources among the OSs of the CEC, including channels, subchannels (devices), and control units (CUs). The invention provides image identifiers (IIDs) for assigning resources to the different OSs. Each shared I/O resource has a sharing set of control blocks (CBs) in which a respective CB is assigned to (and located by) a respective IID of one of the OSs. Each of the CBs in a sharing set provides a different image of the same I/O resource. The different CB images are independently set to different states by I/O operations for the different OSs, so that the OSs can independently share the same I/O resource.

Method and means for sharing I/O resources by a plurality of operating

The invention disclosed and claimed herein provides a method for a virtual machine, which maps to the V=R region of a host machine's address space, to resume program execution successfully when the host operating system terminates and subsequently restarts successfully after the occurrence of a system incident. The system incident brings the computer system down, but with a reasonable chance that the system will be able to bounce. A bounce occurs when the host operating system nucleus is reinitialized or refreshed. The virtual machine will be allowed to survive the system incident as long as its integrity can be maintained, i.e. as long as its status and in-progress work can be preserved. The status and in-progress work of the virtual machine is preserved in a reserved region of host storage in such a way that the time to save and restore virtual machine status is reduced, I/O that might cause further system incidents are avoided and the complexity of restoration of the virtual machine during a system incident is reduced.

Recovery of guest virtual machines after failure of a host real machine

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Poughkeepsie, NY, United States of America

Paul A Malinowski