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A Generic Fault-Tolerant Architecture for Real-Time Dependable Systems (Hardcover, 2001 ed.)
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A Generic Fault-Tolerant Architecture for Real-Time Dependable Systems (Hardcover, 2001 ed.)
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The design of computer systems to be embedded in critical real-time
applications is a complex task. Such systems must not only
guarantee to meet hard real-time deadlines imposed by their
physical environment, they must guarantee to do so dependably,
despite both physical faults (in hardware) and design faults (in
hardware or software). A fault-tolerance approach is mandatory for
these guarantees to be commensurate with the safety and reliability
requirements of many life- and mission-critical applications. A
Generic Fault-Tolerant Architecture for Real-Time Dependable
Systems explains the motivations and the results of a collaborative
project(*), whose objective was to significantly decrease the
lifecycle costs of such fault-tolerant systems. The end-user
companies participating in this project currently deploy
fault-tolerant systems in critical railway, space and
nuclear-propulsion applications. However, these are proprietary
systems whose architectures have been tailored to meet
domain-specific requirements. This has led to very costly,
inflexible, and often hardware-intensive solutions that, by the
time they are developed, validated and certified for use in the
field, can already be out-of-date in terms of their underlying
hardware and software technology. The project thus designed a
generic fault-tolerant architecture with two dimensions of
redundancy and a third multi-level integrity dimension for
accommodating software components of different levels of
criticality. The architecture is largely based on commercial
off-the-shelf (COTS) components and follows a software-implemented
approach so as to minimise the need for special hardware. Using an
associated development and validationenvironment, system developers
may configure and validate instances of the architecture that can
be shown to meet the very diverse requirements of railway, space,
nuclear-propulsion and other critical real-time applications. This
book describes the rationale of the generic architecture, the
design and validation of its communication, scheduling and
fault-tolerance components, and the tools that make up its design
and validation environment. The book concludes with a description
of three prototype systems that have been developed following the
proposed approach. (*) Esprit project No. 20716: GUARDS: a Generic
Upgradable Architecture for Real-time Dependable Systems.
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