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A practical dependability measure for degradable computer systems with non-exponential degradation

Artikel i vetenskaplig tidskrift
Författare Erland Jonsson
Mikael Andersson
Sören Asmussen
Publicerad i IFAC Symposium on Fault Detection, Supervision and Safety for Technical Processe - SAFEPROCESS 1994
Volym Vol. 1
Sidor 231-237
Publiceringsår 1994
Publicerad vid Institutionen för matematik
Sidor 231-237
Språk en
Ämnesord dependability, safety, performability, measure, computer system
Ämneskategorier Data- och informationsvetenskap

Sammanfattning

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.

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