Istituto di Scienza e Tecnologie dell'Informazione     
Bondavalli A., Chiaradonna S., Di Giandomenico F., Grandoni F. Discriminating fault rate and persistency to improve fault treatment. In: Digest of Papers Twenty-Seventh Annual International Symposium on Fault-Tolerant Computing (Seattle, Washington, 24-27 Jun 1997). Proceedings, pp. 354 - 362. IEEE Conference Publications, 1997.
In this paper the consolidate identification of faults, distinguished as transient or permanent/intermittent, is approached. Transient faults discrimination has long been performed in commercial systems: threshold-based techniques have been practice for several years for this purpose. The present work aims to contribute to the usefulness of the count-and-threshold scheme, through the analysis of its behaviour and the exploration of its effects on the system. To this goal, the scheme is mechanized as a device named α-count, endowed with a few controllable parameters. α-count tries to balance between two conflicting requirements: to keep in the system those components that have experienced just transient faults; and to remove quickly those affected by permanent or intermittent faults. Analytical models are derived, allowing detailed study of α-count's behaviour; the actual evaluation, in a range of configurations, is performed by standard tools, in terms of the delay in spotting faulty components and the probability of improperly blaming correct ones.
DOI: 10.1109/FTCS.1997.614109

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