Get A Generic Fault-Tolerant Architecture for Real-Time PDF

By David Powell

ISBN-10: 1441948805

ISBN-13: 9781441948809

ISBN-10: 1475733534

ISBN-13: 9781475733532

The layout of desktops to be embedded in severe real-time functions is a fancy activity. Such structures mustn't ever basically warrantly to fulfill tough real-time time cut-off dates imposed through their actual surroundings, they have to warrantly to take action dependably, regardless of either actual faults (in undefined) and layout faults (in or software). A fault-tolerance technique is crucial for those promises to be commensurate with the protection and reliability standards of many existence- and mission-critical purposes. This ebook explains the motivations and the result of a collaborative project', whose target was once to noticeably reduce the lifecycle bills of such fault­ tolerant structures. The end-user businesses partaking during this venture already installation fault-tolerant platforms in serious railway, area and nuclear-propulsion functions. although, those are proprietary platforms whose architectures were adapted to satisfy domain-specific requisites. This has ended in very high priced, rigid, and infrequently hardware-intensive suggestions that, by the point they're built, proven and licensed to be used within the box, can already be out-of-date when it comes to their underlying and software program technology.

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

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If we take such a small value for p, then LL becomes better than ST. The factorisation of this fomula follows that given in [Ramanathan et al. 1990]. But note that the exact reformulation of [Ramanathan et al. 1990] is incorrect (omission of the scalar 3 in front of d in the third term). Inter-Channel Communication Network 34 • We have taken a rather optimistic maximum transmission delay d, taking into account that GUARDS channels are expected to be near each other (typically a few decimeters).

2 Notation We denote p, q, r, s the indexes of the nodes connected through the ICN, and we describe the protocol from the local node viewpoint. We use the following notation: Variable holding the private value of node p. Vq(p) Variable holding the estimation by node'q of private value of node p. p_broadcast(in msg) Function allowing node p to broadcast a message msg to every other nodes through the ICN. Each node q, r, s will receive the broadcast message on its private ICN link coming from node p.

Any value, if the emitter is arbitrary-faulty. 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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