Electrical computers and digital data processing systems: input/ – Input/output data processing – Input/output access regulation
Reexamination Certificate
2009-04-20
2011-12-06
Sorrell, Eron J (Department: 2182)
Electrical computers and digital data processing systems: input/
Input/output data processing
Input/output access regulation
C710S036000, C710S062000, C710S074000, C370S248000, C714S043000, C714S056000
Reexamination Certificate
active
08073993
ABSTRACT:
A redundancy manager manages commands to peripheral devices in a computer system. These peripheral devices have multiple pathways connecting it to the computer system. The redundancy manager determines the number of independent pathways connected to the peripheral device, presents only one logical device to the operating system and any device driver and any other command or device processing logic in the command path before the redundancy manager. For each incoming command, the redundancy manager determines which pathways are properly functioning and selects the best pathway for the command based at least partly upon a penalty model where a path may be temporarily penalized by not including the pathway in the path selection process for a predetermined time. The redundancy manager further reroutes the command to an alternate path and resets the device for an alternate path that is not penalized or has otherwise failed.
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Bauman Scott A.
Bowles Brian L.
Vinski Anthony P.
Weckwerth Rick A.
International Business Machines - Corporation
Sorrell Eron J
Truelson Roy W.
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