Application-layer fault-tolerance protocols by Vincenzo De Florio

By Vincenzo De Florio

During this technological period, failure to deal with application-layer fault-tolerance, a key element to crafting really accountable machine prone, leaves the door open to unlucky effects in caliber of carrier.

Application-Layer Fault-Tolerance Protocols raises information of the necessity for application-layer fault-tolerance (ALFT) via advent of difficulties and qualitative research of strategies. an important learn for researchers, practitioners, and scholars in dependability engineering, this booklet collects rising examine to provide a scientific, serious association of the present wisdom in ALFT.

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Copyright © 2009, IGI Global, distributing in print or electronic forms without written permission of IGI Global is prohibited. Fault-Tolerant Software 23 More formally, for some functions f and g it is true that Service = f (program), program = g(specification). A first (obvious) conclusion is the hard link between the service and its specification: Service = g • f (specification). Building robust versions of f and g is well known as being a difficult, non trivial job. Now let us concentrate on the range of g (the software set).

2. 3. Programming errors have been significantly reduced by extensive testing on a simulator. Any residual software error is not included in the analysis. Program software does not wear out or degrade. Possible faults belong to the following two classes: Hardware physical faults and transient physical faults induced by alpha particles and electromagnetic noise. The Therac-25 software was very complex. It consisted of four major components: Stored data, a scheduler, a set of critical and non-critical tasks, and interrupt services.

Faults that occur when replicated information in a system becomes inconsistent, either because replicates that are supposed to provide identical results no longer do so, or because the aggregate of the data from the various replicates is no longer consistent with system specifications. , a service on which reliance can be placed justifiably, calls for the combined utilization of a set of methods and techniques globally referred to as the “means for dependability” (Laprie, 1998): • • • fault prevention aims at preventing the occurrence or introduction of faults.

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