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Conservative reliability assessment of a 2-channel software system when one of the channels is probably perfect

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  • Popov, Peter

Abstract

In this paper we subject to scrutiny some recent advances in conservative reliability assessment of 2-channel fault-tolerant software, based on the probability of perfection of one of the channels. Our approach extends the previous works by looking in detail at the implications of the assumptions made in these previous works about the relationships between the probability of failure of the channels and of the system, which have not been explored before. We demonstrate that the assumptions made by others impose significant constraints on the epistemic uncertainty of the probability of system failure and explore the implications of these constraints to derive new conservative bounds.

Suggested Citation

  • Popov, Peter, 2021. "Conservative reliability assessment of a 2-channel software system when one of the channels is probably perfect," Reliability Engineering and System Safety, Elsevier, vol. 216(C).
    • Handle: RePEc:eee:reensy:v:216:y:2021:i:c:s0951832021005172
    DOI: 10.1016/j.ress.2021.108008
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    References listed on IDEAS

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    1. Popov, Peter, 2013. "Bayesian reliability assessment of legacy safety-critical systems upgraded with fault-tolerant off-the-shelf software," Reliability Engineering and System Safety, Elsevier, vol. 117(C), pages 98-113.
    2. Zhao, Xingyu & Littlewood, Bev & Povyakalo, Andrey & Strigini, Lorenzo & Wright, David, 2017. "Modeling the probability of failure on demand (pfd) of a 1-out-of-2 system in which one channel is “quasi-perfectâ€," Reliability Engineering and System Safety, Elsevier, vol. 158(C), pages 230-245.
    3. Zhao, Xingyu & Littlewood, Bev & Povyakalo, Andrey & Strigini, Lorenzo & Wright, David, 2018. "Conservative claims for the probability of perfection of a software-based system using operational experience of previous similar systems," Reliability Engineering and System Safety, Elsevier, vol. 175(C), pages 265-282.
    4. Bishop, Peter & Povyakalo, Andrey, 2020. "A conservative confidence bound for the probability of failure on demand of a software-based system based on failure-free tests of its components," Reliability Engineering and System Safety, Elsevier, vol. 203(C).
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