Download A Generic Fault-Tolerant Architecture for Real-Time by David Powell PDF

By David Powell

The layout of desktops to be embedded in severe real-time functions is a posh job. Such structures mustn't ever purely warrantly to satisfy demanding real-time time cut-off dates imposed by means of their actual atmosphere, they need to warrantly to take action dependably, regardless of either actual faults (in undefined) and layout faults (in or software). A fault-tolerance process is needed for those promises to be commensurate with the security and reliability necessities of many lifestyles- and mission-critical functions. This publication explains the motivations and the result of a collaborative project', whose goal was once to seriously lessen the lifecycle bills of such fault­ tolerant structures. The end-user businesses engaging during this venture already install fault-tolerant platforms in serious railway, house and nuclear-propulsion purposes. although, those are proprietary structures whose architectures were adapted to fulfill domain-specific specifications. This has resulted in very expensive, rigid, and infrequently hardware-intensive recommendations that, by the point they're constructed, established and authorized to be used within the box, can already be out-of-date when it comes to their underlying and software program technology.

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Example text

For each prototype instance. This work provides the foundation of a generic modelling approach to guide the choice of a particular instantiation of the architecture, according to the dependability requirements of the end-user application. A large number of parameters (proportion of transient vs. ) have been included in the models, allowing intensive sensitivity analyses to be carried out. ). Specific work has addressed hierarchical modelling with the aim of mastering the complexity of such detailed models [Jenn 1998a].

This separation of the integrity levels on different lanes provides improved segregation ("fire-walling") between the two levels of integrity. 2 (Chapter 10). 11 Summary This chapter has outlined the motivations for the generic fault-tolerant architecture and its associated development and validation environment. The principal features of the architecture have been briefly described and the main validation activities delineated. We have also described the domain-specific instances of the architecture that have guided the thought process of the project team.

Another case, perhaps less intricate, would be to consider a decrease in the transmission speed of one link between its broadcast point and one of the receivers. 2 to occur. Briefly, the technical trade-off is the following: • Assume the possible presence of Byzantine clocks. This leads to synchronisation algorithms involving several rounds of message exchange (dynamically managed at each cycle) and having a large skew between clocks (which could impede the genericity of GUARDS for some demanding applications).

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