A Generic Fault-Tolerant Architecture for Real-Time - download pdf or read online

Quality Control

By David Powell

ISBN-10: 1441948805

ISBN-13: 9781441948809

ISBN-10: 1475733534

ISBN-13: 9781475733532

The layout of desktops to be embedded in serious real-time functions is a fancy activity. Such platforms mustn't ever simply warrantly to satisfy difficult real-time time cut-off dates imposed through their actual setting, they need to warrantly to take action dependably, regardless of either actual faults (in undefined) and layout faults (in or software). A fault-tolerance method is crucial for those promises to be commensurate with the protection and reliability requisites of many lifestyles- and mission-critical functions. This ebook explains the motivations and the result of a collaborative project', whose goal used to be to noticeably lessen the lifecycle bills of such fault­ tolerant structures. The end-user businesses engaging during this undertaking already installation fault-tolerant platforms in severe railway, area and nuclear-propulsion functions. despite the fact that, those are proprietary structures whose architectures were adapted to satisfy domain-specific necessities. This has ended in very high priced, rigid, and sometimes hardware-intensive ideas that, by the point they're constructed, demonstrated and authorized to be used within the box, can already be out-of-date when it comes to their underlying and software program technology.

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Additional info for A Generic Fault-Tolerant Architecture for Real-Time Dependable Systems

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The Temporal Properties Analysis tool-set includes a Schedulability Analyser and a Scheduler Simulator, based on those available in HRT-HoodNICE. They have been enhanced to provide a more precise and realistic analysis (by taking into account the concept of thread offsets) and to cope with the specific needs of a redundant fault-tolerant architecture (by allowing the analysis of the interactions over the ICN). A further result of the Physical Architecture design is that, on the basis of the real-time models produced by the verification tools, the critical interactions among software functions on different channels are scheduled in a deterministic way.

A Generic Fault-Tolerant Architecture for Real-Time Dependable Systems 25 As long as both channels are operational, they operate in a two-out-of-two mode. Results of computations that are declared as error-free by the intra-channel mechanisms are compared and, in case of disagreement, the instance is put into a safe state. However, if errors are detected locally, by intra-channel mechanisms, the channel declares itself to be faulty and the instance switches to single channel operation. Note that this strategy is different to that of the two-channel configurations of the railway instances (duplex instance, or triplex instance degraded to duplex); those instances switch to a safe state whether the error is detected locally or by comparison.

Note that in the first three cases, all receiver nodes obtain the same value. 2 Assumptions The ZA algorithm relies on the following assumptions: Al Every message that is sent between non-faulty processors is correctly delivered. In particular, link faults are considered indistinguishable9 from node faults. A2 The receiver of a message knows who sent it (each node has a private link to the other nodes, cf. 4). At the protocol level, a symmetric-faulty transmitter node is indistinguishable from a non-faulty node.

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A Generic Fault-Tolerant Architecture for Real-Time Dependable Systems by David Powell


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