Unisys Corporation

Frederick George Fellenser

Mitchell A Bauman

Roger Lee Gilbertson

Michael L Haupt

Penny L Svenkeson

James L Depenning

Donald R Kalvestrand

Daniel S Tokoly

Josh David Collier

Maria A Liedman

An apparatus containing a maintenance interface unit is described. In one exemplary implementation, the apparatus includes a multiprocessor system and the maintenance interface unit. The multiprocessor system uses cache coherency for accessing memory. The maintenance interface unit is integrated within the multiprocessor system and is configured to provide a backdoor accessibility to the multiprocessor system on-behalf of a peripheral maintenance system. The maintenance interface unit is also configured to perform operations within the multiprocessor system while maintaining the cache coherency.

Maintenance interface unit for servicing multiprocessor systems

Poisoning of specific memory locations as a process when a part of a multiprocessor computer system becomes faulty leads to ability to isolate specific data owned by individual failing units even in a shared memory area. Also continuous processing by non-failing units is allowable. A support processor handles non-immediate problems and allows resetting of memory locations formerly owned by failed units.

System and method for fault handling and recovery in a multi-processing system having hardware resources shared between multiple partitions

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Paoli, PA, United States of America

Frederick George Fellenser