Model-Driven Evaluation of User-Perceived Service Availability

Thursday, April 4, 2013, 17:38
Model-Driven Evaluation of User-Perceived Service Availability Authors:
Andreas Dittrich
Rafael Rezende

14th European Workshop on Dependable Computing (EWDC), Coimbra, Portugal, May 15-16, 2013

Download: accepted version, the final publication is available at

Service-oriented architecture (SOA) has emerged as an approach to master growing system complexity by proposing services as basic building elements of system design. However, it remains difficult to evaluate dependability of such distributed and heterogeneous functionality as it depends highly on the properties of the enabling information and communications technology (ICT) infrastructure. Moreover, every specific pair service client and provider can utilize different ICT components, constituting for the user-perceived view of a service. We provide a model-driven methodology to automatically create reliability block diagrams of such views. Given a service description, a network topology model and a pair service client and provider, it identifies relevant ICT components and generates a user-perceived service availability model (UPSAM). We then use this UPSAM to calculate the steady-state availability of different views on an exemplary mail service deployed in the network infrastructure of University of Lugano, Switzerland.

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