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By Vincenzo De Florio

During this technological period, failure to handle application-layer fault-tolerance, a key factor to crafting really liable laptop companies, leaves the door open to unlucky outcomes in caliber of provider.

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

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Figure 3. Laprie’s fault classification scheme Copyright © 2009, IGI Global, distributing in print or electronic forms without written permission of IGI Global is prohibited. 12 De Florio • • Accidental, permanent, design faults (also called systematic faults, or Bohrbugs): flawed algorithms that systematically turn into the same errors in the presence of the same input conditions and initial states—for instance, an unchecked divisor that can result in a division-by-zero error. Accidental, temporary design faults (known as Heisenbugs, for “bugs of Heisenberg”, after their elusive character): while systematic faults have an evident, deterministic behavior, these bugs depend on subtle combinations of the system state and environment.

2003). Dependable Computing: An Overview. Theor. Comput. (290), 1115–1126. Patterson, D. , & Hennessy, J. L. (1996). ). Morgan Kaufmann, S. Francisco, CA. Powell, D. (1997, January). Preliminary definition of the GUARDS architecture (Tech. Rep. No. 96277). LAAS-CNRS. Copyright © 2009, IGI Global, distributing in print or electronic forms without written permission of IGI Global is prohibited. Dependability and Fault-Tolerance 19 Randell, B. (1975, June). System Structure for Software Fault Tolerance.

An expansion of the dependence relation In the following two sections the system and fault models are characterized. Dependable Services: The System Model The system model characterizes the properties of the system components our program depends upon. It could be represented as a tree like the one in Fig. 1 whose leaves are computation, communication and clock sub-systems. These leaves are annotated with statements representing some expected properties of the corresponding sub-systems. Synchronous System Model A well-known system model is the synchronous model: In such a system the service depends on “perfect” (ideal) computation, communication and clock sub-systems.

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