Istituto di Scienza e Tecnologie dell'Informazione     
Bondavalli A., Chiaradonna S., Cotroneo D., Romano L. A Fault-tolerant distributed legacy-based system and its evaluation. In: LADC 2003, Dependable Computing, First Latin-American Symposium (Sao Paulo, Brazil, 2-21 October 2003). Proceedings, pp. 303 - 320. Rogério de Lemos, Taisy Silva Weber, João Batista Camargo Jr (eds.). (Lecture Notes in Computer Science, vol. 2847). Springer, 2003.
In this paper, we present a complete architecture for improving the dependability of complex COTS and legacy-based systems. For long-lived applications, such as most of those being constructed nowadays via integration of legacy subsystems, fault treatment is a very important part of the fault tolerance strategy. The paper advocates the need for careful diagnosis and damage assessment, and for precise and effective recovery actions, specifically tailored to the a®ecting fault and/or to the extent of the damage in the affected component. In our proposal, threshold-based mechanisms are exploited to trigger alternative actions. The design and implementation of the resulting solution is illustrated with respect to a case study. This consists of a distributed architectural framework, handling replicated legacy-based subsystems. Replication and voting are used for error detection and masking. An experimental prototype deployed over a COTS-based LAN is described and has allowed a dependability analysis, via combined use of direct measurements and analytical modeling.
URL: http://dcl.isti.cnr.it/Documentation/Papers/LADC2003AndreaBondavalli-2003_2.pdf
Subject Software Implemented
Fault Tolerance
Fault Diagnosis
Fault Treatment
Legacy systems
Threshold-based mechanisms
CORBA Architectures

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