International Business Machines Corporation

William Charles Neiman

David Harold Surman

Georgette L Kurdt

Jeffrey Mark Nick

Michael J Jordan

Kelly B Pushong

Ruth A Allen

Mark A Brooks

David Arlen Elko

Jessie Yu

Catherine Mary Moxey

Michael L Greenblatt

Kenneth Glenn Rothwell

Neil Alan Johnson

Scott F Schiffer

Allen Carney

A system includes a shared memory accessible by a plurality of members of a shared memory system, and a processor operably coupled to the shared memory system. The processor is configured to receive a command from an exploiting member of the plurality of members, the command instructing an update to a piece of shared data, perform the update to the piece of shared data, and send an invalidation signal to each other member of the plurality of members. An invalidation signal sent to a respective member indicates that a local copy of the piece of data stored by the respective member is no longer valid, and each invalidation signal is sent asynchronously with respect to processing of the command. The processor is further configured to return the results of the command to the exploiting member.

Management of shared memory using asynchronous invalidation signals

A computer-implemented method for asynchronous duplexing between two computing devices includes obtaining a task for execution by a first computing device and executing the task. A first computing task completion identifier is assigned upon execution of the task. The task with the assigned first computing task completion identifier is transferred to a second computing device and executed. A second computing task completion identifier is assigned upon execution of the task. The first computing task completion identifier and the second computing task identifier are logged into a task management log for facilitating the recovery of the first computing device by comparing the first computing task completion identifier and the second computing task identifier for identifying tasks executed by the first computing device and requiring execution by the second computing device.

Asynchronous duplexing

System-managed duplexing of coupling facility structures. A plurality of instances of coupling facility structures are maintained in a plurality of coupling facilities. Duplexing processing associated with the plurality of instances is managed by one or more operating systems, making many of the steps associated with duplexing transparent to the exploiters of the coupling facility structures. System-managed duplexing provides high availability for coupling facility structure data via a robust recovery mechanism (i.e., duplexing failover).

Managing processing associated with coupling facility Structures

System-managed duplexing of coupling facility structures

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William Charles Neiman