Method and apparatus for automatic recovery from a failed...

Multiplex communications – Diagnostic testing

Reexamination Certificate

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Details

C370S248000, C370S252000, C710S302000, C710S304000

Reexamination Certificate

active

07453816

ABSTRACT:
A method, apparatus, and computer instructions are provided by the present invention to automatically recover from a failed node concurrent maintenance operation. A control logic is provided to send a first test command to processors of a new node. If the first test command is successful, a second test command is sent to all processors or to the remaining nodes if nodes are removed. If the second command is successful, system operation is resumed with the newly configured topology with either nodes added or removed.If the response is incorrect or a timeout has occurred, the control logic restores values to the current mode register and sends a third test command to check for an error. A fatal system attention is sent to a service processor or system software if an error is encountered. If no error, system operation is resumed with previously configured topology.

REFERENCES:
patent: 6070207 (2000-05-01), Bell
patent: 6681282 (2004-01-01), Golden et al.
patent: 7107398 (2006-09-01), Depew et al.
patent: 2002/0075870 (2002-06-01), de Azevedo et al.
patent: 2003/0167367 (2003-09-01), Kaushik et al.
patent: 2003/0193890 (2003-10-01), Tsillas et al.
patent: 2006/0159007 (2006-07-01), Frutiger et al.

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