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arXiv · 1811.05548

Measuring Masking Fault-Tolerance

Pablo F. Castro·Pedro R. D'Argenio·Ramiro Demasi·Luciano Putruele
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Abstract

In this paper we introduce a notion of fault-tolerance distance between labeled transition systems. Intuitively, this notion of distance measures the degree of fault-tolerance exhibited by a candidate system. In practice, there are different kinds of fault-tolerance, here we restrict ourselves to the analysis of masking fault-tolerance because it is often a highly desirable goal for critical systems. Roughly speaking, a system is masking fault-tolerant when it is able to completely mask the faults, not allowing these faults to have any observable consequences for the users. We capture masking fault-tolerance via a simulation relation, which is accompanied by a corresponding game characterization. We enrich the resulting games with quantitative objectives to define the notion of masking fault-tolerance distance. Furthermore, we investigate the basic properties of this notion of masking distance, and we prove that it is a directed pseudo metric. We have implemented our approach in a prototype tool that automatically compute the masking distance between a nominal system and a fault-tolerant version of it. We have used this tool to measure the masking tolerance of multiple instances of several case studies

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Pablo F. Castro, Pedro R. D'Argenio, Ramiro Demasi, Luciano Putruele. 2018-11-20. Measuring Masking Fault-Tolerance. https://arxiv.org/abs/1811.05548

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