Slides - Åbo Akademi

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System Dependability A. Avizienis, J.-C. Laprie and B. Randell: Dependability and its Threats (2004): Dependability is the ability of a system to deliver a service that can be justifiably trusted or, alternatively, as the ability of a system to avoid service failures that are more frequent or more severe than is acceptable Dependability attributes: reliability, availability, maintainability, safety, confidentiality, integrity
Reliability Definition Reliability: the ability of a system to deliver correct service under given conditions for a specified period of time Reliability is generally measured by the probability that a system (or system component) S can perform a required function under given conditions for the time interval [0, t]: R(t) = P {S not failed over time [0, t]}
Page 1: Software Safety Lecture 8: System R
Page 5 and 6: Safety-critical Systems • Pervasi
Page 7 and 8: Hardware Failures The system is sai
Page 9 and 10: Failure Rate (ctd.) Classification
Page 11 and 12: Most Important Distributions Discre
Page 13 and 14: Reliability Parameters MTTF: Mean T
Page 15 and 16: Exponential Distribution The distri
Page 17 and 18: MTTF Example A system with a consta
Page 19 and 20: Example: Failure Rate Calculation F
Page 21 and 22: Series Systems Such a configuration
Page 23 and 24: Series-Parallel Combinations The mo
Page 25 and 26: M-of-N Arrangement A system consist
Page 27 and 28: Failure rate The term failure inten
Page 29 and 30: Design diversity Each variant of so

Slides - Åbo Akademi

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