Application-layer fault-tolerance protocols by Vincenzo De Florio

By Vincenzo De Florio

During this technological period, failure to handle application-layer fault-tolerance, a key element to crafting really accountable desktop companies, leaves the door open to unlucky effects in caliber of provider.

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

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In particular, an internal fault is said to be active when it produces an error, and dormant (or latent) when it does not. A dormant fault becomes an active fault when it is activated by the computation process or the environment. Fault latency is defined as either the length of time between the occurrence of a fault and the appearance of the corresponding error, or the length of time between the occurrence of a fault and its removal. Faults can be classified according to five viewpoints (Laprie, 1992, 1995, 1998)—phenomenological cause, nature, phase of creation or occurrence, situation with respect to system boundaries, persistence.

The Flight Control System of the Ariane 5 was of a standard design. The attitude of the launcher and Copyright © 2009, IGI Global, distributing in print or electronic forms without written permission of IGI Global is prohibited. Fault-Tolerant Software 29 its movements in space were measured by an Inertial Reference System (SRI). The SRI had its own internal computer, in which angles and velocities were calculated on the basis of information from a strap-down inertial platform, with laser gyros and accelerometers.

To minimize this overhead, some of these faults were not included in the fault model, reduced to a smaller F0. One of the faults in F but not in F0 triggered the chain of events that ultimately led to the Ariane failure. Faulty Specifications: The Mariner 1 The Mariner Program, a series of ten spacecrafts, was started by NASA on July 22, 1962 with the launch of Mariner 1 and ended on November 3, 1973, with the launch of Mariner 10. Other spacecraft, based on these, were continued with different names, like Voyager and Viking.

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