Download Fault-Tolerant Computing Systems: Tests, Diagnosis, Fault by Miroslaw Malek (auth.), Mario Dal Cin, Wolfgang Hohl (eds.) PDF

By Miroslaw Malek (auth.), Mario Dal Cin, Wolfgang Hohl (eds.)

In den complaints zur five. Internationalen GI/ITG/GMA-Tagung }ber Fehlerorientierte Rechensysteme in N}rnberg standen exams, Diagnose und Fehlerbehandlung als Leitthemen im Mittelpunkt. Allerdings wurden auch die Themen Zuverl{ssigkeit, Verf}gbarkeit und Sicherheit in tough- und Softwaresystemen behandelt. Der Tagungsband gibt mit eingeladenen und eingereichten Beitr{gen, die von einem internationalen Programmausschu~ sorgf{ltig ausgew{hlt wurden, eine ]bersicht }ber den Stand der Forschung, Entwicklung und Anwendungen aller Fehlertoleranz- und Zuverl{ssigkeitsaspekte.

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Read or Download Fault-Tolerant Computing Systems: Tests, Diagnosis, Fault Treatment 5th International GI/ITG/GMA Conference Nürnberg, September 25–27, 1991 Proceedings PDF

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Additional resources for Fault-Tolerant Computing Systems: Tests, Diagnosis, Fault Treatment 5th International GI/ITG/GMA Conference Nürnberg, September 25–27, 1991 Proceedings

Example text

M must ensure both correct fault masking and synchronization of the establishment of recovery points. According to the token-strategy, as presented in section 3, consistent decisions must be taken at different nodes in a fault-tolerant way [NaTa 87, Echt 89b). The protocol must transfer information from the sources N v ... , N m to the sinks Nm+V ... m for the purpose of fault masking, and to the sinks N 1, ... , N m for the purpose of synchronization, by satisfying the following specification: Fault masking: If fNL ::; (m - 1) / 2, a MPS is caused at the most.

Active diagnosis: In suitable intervals (typically about 100 msec) all intact transputers send '/ am alive' messages over the corresponding LAs to their NEWS neighbors. In principle neighborhood diagnosis could be carried out by all 8 neighbors instead of the NEWS ones only. This would clearly increase the system level diagnosibility. However, because of pin limitation on our backplane connectors we had to restrict passive diagnosis to 4 nodes (only 4 error interrupt lines available). Although there are no such limitations concerning the active diagnosis, for reasons of symmetry and for keeping the overhead caused by the '/ am alive' messages low we decided to restrict it to 4 neighboring nodes as well.

A total of m replicates A1, ... , Am of this process form an (n-out-of-m>-system, allocated at nodes N 1, ... , N m. The number n is an integer greater than 1, and m =2'n -1, which is always odd. Node Ni is equipped with an absolute test Ti for periodic and event-driven checks of local fault occurrence (1 :5 i :5 m) [DGTr 861. In order to avoid a reliability bottleneck, replicated voters V1, ... , Vm are allocated at m different nodes Nm+1' ... m [Gunn 831. The voters can select faultless results independently, since we assume deterministic behaviour of the application process A.

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