A practical dependability measure for degradable computer systems with non-exponential degradation
Journal article, 1994

This paper proposes a vectorized measure for a set of behavioural dependability attributes. The measure is based on Markov processes and is intended for practical dependability trade-offs. It describes the system performance on a number of service levels. Thus, it is possible to merge attributes such as reliability, safety and performability into one single quality. Whereas reliability describes the functional fulfillment of a system, performability reflects its ability of functional degradation. The safety attribute handles a class of failures with catastrophic consequences and can be accommodated by means of introducing two or more service levels for a failed system.Many systems exhibit time-dependent degradation rates and non–exponential lifetimes. This situation can be handled by means of applying phase–type assumptions and introducing some additional states to the system, which would allow us to remain within the universe of Markov modelling.




computer system



Erland Jonsson

Department of Computer Engineering

Mikael Andersson

University of Gothenburg

Department of Mathematics

Sören Asmussen

IFAC Symposium on Fault Detection, Supervision and Safety for Technical Processe - SAFEPROCESS 1994

Vol. Vol. 1 231-237

Subject Categories

Computer and Information Science

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