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Sequencing Tasks to Minimize the Effects of Near-Coincident Faults in TMR Controller Computers
November 1996 (vol. 45 no. 11)
pp. 1331-1337

Abstract—Although Triple Modular Redundancy (TMR) has been widely used to mask the effects of a single faulty module, it cannot tolerate coincident faults in multiple modules caused by a common source, such as an environmental disruption or malfunction of a shared component. We propose a method to eliminate or alleviate the effects of (near) coincident faults by sequencing tasks on different modules in a TMR system. Specifically, we develop an effective sequencing of tasks to simply place an "optimal" distance (in the sense of minimizing the mean number of faulty tasks due to TMR failures) between the copies of a task to be executed on different modules. Several examples are presented, showing significant improvements in reducing TMR failures with the proposed task sequencing.

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Index Terms:
TMR failure; common-cause and independent faults; conventional, random, and effective sequencing of tasks; Task Interval (TI), task distance.
Citation:
Hagbae Kim, Kang G. Shin, "Sequencing Tasks to Minimize the Effects of Near-Coincident Faults in TMR Controller Computers," IEEE Transactions on Computers, vol. 45, no. 11, pp. 1331-1337, Nov. 1996, doi:10.1109/12.544492
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