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How to capture dynamic behaviours of dependable systems
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How to capture dynamic behaviours of dependable systems   (Citations: 1)
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In terms of reliability, a unit, subsystem or system is considered dynamic if its failure probability is variable. From the system point of view, the reliability depends on the units' dynamics, on the inter- dependencies arising among such units (load-sharing, standby redun- dancy, interferences, etc) and on their reliability relationships, that can also be variable (phased-mission systems). Such peculiarities have great impact on the choice of the technique to be used to evaluate the reliability of a system. Combinatorial techniques can be adopted in case the system's units are stochastically independent. Otherwise, it is requested to recur to lower level techniques and formalisms, such as: state space methods, hybrid (combinatorial/state space) tech- niques or simulation. This paper analyzes the reliability of fault tol- erant/dependent/dynamic systems. The approach exploited is based on the concept of dependencies and their composition. In the paper we deeply investigate such concepts from an high level of abstraction. Moreover, basing on the use of dynamic reliability block diagrams, a notation we developed by extending the well known reliability block diagrams, we detail how this modeling approach captures dynamic re- liability behaviors. In order to demonstrate the efiectiveness of such technique, we mainly focus the discussion on fault tolerant-dynamic- dependent computing systems, investigating some dynamic reliabil- ity/availability behaviors and providing the guidelines for their repre- sentation and evaluation. The discussion is supported by the results obtained evaluating a complex fault tolerant computing system with several units afiected by common cause events, shared workloads and other dynamic-dependable behaviors.
Journal: International Journal of Parallel, Emergent and Distributed Systems - IJPEDS , vol. 24, no. 2, pp. 127-150, 2009
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