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Design Diversity For Redundant Systems (1999)
| Venue: | 29TH INTERNATIONAL SYMPOSIUM ON FAULT-TOLERANT COMPUTING (FTCS-29) FAST ABSTRACTS |
| Citations: | 4 - 4 self |
BibTeX
@TECHREPORT{Mitra99designdiversity,
author = {Subhasish Mitra and Nirmal R. Saxena and Edward J. McCluskey},
title = {Design Diversity For Redundant Systems},
institution = {29TH INTERNATIONAL SYMPOSIUM ON FAULT-TOLERANT COMPUTING (FTCS-29) FAST ABSTRACTS},
year = {1999}
}
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Abstract
Design diversity has long been known to protect redundant systems against common-mode failures. In this paper, for the first time, we present a metric to quantify diversity among several designs. Based on this metric, we derived analytical reliability models that show a simple relationship between design diversity, system failure rate, and mission time. In addition, we also present simulation results to demonstrate the effectiveness of design diversity in duplex and Triple Modular Redundant (TMR) systems. For independent multiple-module failures, both the analytical and simulation results show that there is no obvious advantage of using diversity in redundant systems. However, for common-mode failures, there is a significant gain in using diversity --- however, the gain diminishes as the mission time increases. For a particular example, if the mission time goes down by a factor of 10, the reliability of a diverse system improves by more than a factor of 4 over a non-diverse system. Finally, our simulation results point out that diversity can enhance the self-testing properties of redundant systems.
Keyphrases
design diversity redundant system common-mode failure mission time simulation result obvious advantage diverse system several design triple modular redundant independent multiple-module failure non-diverse system gain diminishes mission time increase simple relationship self-testing property first time system failure rate analytical reliability model particular example present simulation result significant gain
