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Paper ID: 1630

FT-Grid: A Fault-Tolerance System for e-Science
Paul,Townend Paul,Groth Nik,Looker Jie,Xu

Appeared in: Proceedings of the UK e-Science All Hands Conference 2005 website: http://www.allhands.org.uk/2005/
Page Numbers:
Publisher: Engineering and Physical Sciences Research Council
Year: 2005
ISBN/ISSN: 1-904425-53-4
Contributing Organisation(s):
Field of Science: e-Science

URL: http://www.allhands.org.uk/2005/proceedings/papers/392.pdf

Abstract: The FT-Grid system introduces a multi-version design -based fault tolerance framework that allows faults occurring in service-based systems to be tolerated, thus increasing the dependability of such systems. This paper details the progress that has been made in the development of FT-Grid, including both a GUI client and also a web service interface. We show empirical evidence of the dependability benefits offered by FT-Grid, by performing a dependability analysis using fault injection testing performed with the WS-FIT tool. We then illustrate a potential problem with voting based fault tolerance approaches in the service-oriented paradigm – namely, that individual channels within fault-tolerant systems may invoke common services as part of their workflow, thus increasing the potential for common-mode failure. We propose a solution to this issue by using the technique of provenance to provide FT-Grid with topological awareness. We implement a large test system, and – with the use of the PreServ provenance system developed as part of the PASOA project at the University of Southampton – perform a large number of experiments which show that a topologically-aware FT-Grid system results in a much more dependable system than any other configuration tested, whilst imposing a negligible timing overhead.

Keywords: e-Science, AHM 2005


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