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Education and Innovation in Embedded Systems Design

USI Università della Svizzera italiana, USI Faculty of Informatics, Advanced Learning and Research Institute USI Università della Svizzera italiana USI Faculty of Informatics USI Advanced Learning and Research Institute
TitleUser-Perceived Instantaneous Service Availability Evaluation
Publication TypeConference Paper
Year of Publication2013
AuthorsRezende, R., A. Dittrich, and M. Malek
Conference Name19th Pacific Rim International Symposium on Dependable Computing (PRDC)
Date Published12/2013
PublisherIEEE Computer Society
Conference LocationVancouver, British Columbia, Canada
Keywordsavailability, Client-server systems, Distributed computing, fault tolerance, modeling
Abstract

Today's businesses rely ever more on dependable service provision deployed on information and communications technology (ICT) infrastructures. Service dependability is highly influenced by the individual infrastructure component properties. Combining these properties for consistent dependability analysis is challenging as every service requester might use a different set of components during service usage, constituting the user-perceived view on a service. This paper presents a methodology to evaluate user-perceived instantaneous service availability. It uses three input models: (1) The ICT infrastructure, with failure rates, repair rates and deployment times of all components, (2) an abstract description of complex hierarchical services, (3) a mapping that contains concrete ICT components for the service pair requester and provider, as well as their existing replicas, and a duration of usage. The methodology then automatically generates an availability model from those parts of the ICT infrastructure needed during provision for the specified pair. To calculate instantaneous availability, the age of the ICT components, the order and time of their usage during service provision are taken into account. The methodology supports generation of different availability models, we demonstrate this by providing reliability block diagrams and fault-trees. We demonstrate the feasibility of the methodology by applying it to parts of the network infrastructure of Università della Svizzera italiana, Switzerland.

URLhttp://andreas-dittrich.eu/2013/08/user-perceived-instantaneous-service-availability-evaluation
DOI10.1109/PRDC.2013.49