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Redundancy Management in a Low-Cost Distributed Hardware and Firmware Support for Software-Fault Tolerance
Mälardalen University, Department of Computer Science and Electronics.
Mälardalen University, Department of Computer Science and Electronics.
Mälardalen University, Department of Computer Science and Electronics.ORCID iD: 0000-0002-7235-6888
2007 (English)Report (Other academic)
Abstract [en]

Software is a major source of reliability degradation in dependable systems.

One of the classical remedies is to provide software fault-tolerance by using NVersion

Programming (NVP). However, due to requirements on special hardware

and the need for changes and additions at all levels of the system, NVP solutions

are costly, and have only been used in special cases.

In a previous work, a low-cost architecture for NVP execution was developed.

The key features of this architecture are the use of off-the-shelf components

and that the fault-tolerance functionality, including voting, error detection,

fault-masking, consistency management, and recovery, is moved into a separate

redundancy management circuitry (one for each redundant computing node).

In this article we present an improved design of that architecture, specifically

resolving some potential inconsistencies that were not treated in detail in the original

design. In particular, we present novel techniques for enforcing replica determinism

and a method for reintegration of the redundancy management circuitry

after a transient failure.

Our improved architecture is based on using the Controller Area Network

(CAN). This has several benefits, including low-cost, and that the CAN data consistency

allows us to simplify the mechanisms for replica determinism and reintegration.

Although initially developed for NVP, our redundancy management circuitry

also supports other software replication techniques, such as active replication.

Place, publisher, year, edition, pages
2007.
National Category
Computer Systems
Identifiers
URN: urn:nbn:se:mdh:diva-7077OAI: oai:DiVA.org:mdh-7077DiVA, id: diva2:237087
Available from: 2009-09-25 Created: 2009-09-25 Last updated: 2015-07-29Bibliographically approved

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Hansson, Hans

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