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

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

In den court cases zur five. Internationalen GI/ITG/GMA-Tagung }ber Fehlerorientierte Rechensysteme in N}rnberg standen assessments, Diagnose und Fehlerbehandlung als Leitthemen im Mittelpunkt. Allerdings wurden auch die Themen Zuverl{ssigkeit, Verf}gbarkeit und Sicherheit in not easy- 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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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

As expected, the m-strategy causes the highest overhead in 1:, and the cyclic-strategy about 1/3 thereof for all B. All other strategies benefit from an increasing deviation B in the load. For a low B the (dynamic) wait-strategy is worse than the primitive cyclic-strategy. As its main result, the evaluation turns out that the inaccuracy of the token-strategy has an almost negligible influence, which makes it somewhat worse than the idealstrategy, but significantly better than all other strategies.

S . • • .. --' _ _ Communication path -----. Checkpointing path (a) Checkpointing (b) Reconfiguration and recovery Fig. 5: Distributed checkpointing and reconfiguration for a ring configuration on a DAMP torus (only established communication paths shown) 28 If the spare node itself fails this will be diagnosed in the same way as for application nodes. However, there is no reconfiguration necessary. All tasks are continued on the same nodes as before. g. trees, DeBruijn graphs) as well.

Since many steps of one technique also contribute to another one, we obtain a cost reduction, and hence, an efficiency improvement. Moreover, in case of steps which are individual to some technique when implemented traditionally, we aim at new implementations to enable some steps to support multiple techniques. Mainly the latter aspect induces a large design space not covered in depth so far. Existing fault tolerant systems typically utilize different techniques independently [Rand 861. For example, error correction in the main memory may be used in addition to backward recovery at a higher layer [for example ·'Tandem" described in Maeh 881.

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