Download Fehlertolerierende Rechensysteme / Fault-Tolerant Computing by Nancy G. Leveson (auth.), F. Belli, W. Görke (eds.) PDF

By Nancy G. Leveson (auth.), F. Belli, W. Görke (eds.)

Dieser Band enthält die 38 Beiträge der three. GI/ITG/GMA-Fachtagung über "Fehlertolerierende Rechensysteme". Unter den 10 aus dem Ausland eingegangenen Beiträgen sind four eingeladene Vorträge. Insgesamt dokumentiert dieser Tagungsband die Entwicklung der Konzeption und Implementierung fehlertoleranter Systeme in den letzten drei Jahren vor allem in Europa. Sämtliche Beiträge sind neue Forschungs- oder Entwicklungsergebnisse, die vom Programmausschuß der Tagung aus 70 eingereichten Beiträgen ausgewählt wurden.

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Read or Download Fehlertolerierende Rechensysteme / Fault-Tolerant Computing Systems: 3. Internationale GI/ITG/GMA-Fachtagung / 3rd International GI/ITG/GMA Conference Bremerhaven, 9.–11. September 1987 PDF

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Additional resources for Fehlertolerierende Rechensysteme / Fault-Tolerant Computing Systems: 3. Internationale GI/ITG/GMA-Fachtagung / 3rd International GI/ITG/GMA Conference Bremerhaven, 9.–11. September 1987

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Es spielt die Rolle eines Safes zu Hause). M6chte BG wieder tiber KG' verftigen, so kann er KG' an G zurUcktiberweisen. Geht G verloren, so besorgt er sich ein neues Gerat G' und iiberweist Ka' von G* an G'. Statt eines zweiten sicheren Gerates G* kann zum "Zwischenlagem" von KG' auch die Bank verwendet werden, indem Ka' auf ein Konto von BG in einem anderen Zahlungssystem transferiert wird, oder indem BG bei der Bank Ka' in Form eines passiven Rticksetzpunktes in Verwahrung gibt [WaPC87]. 2 Anderungsaufzeichnung Will man bei der Initialisierung von G' samtlich~ jemals von G gemachten Transaktionen berUcksichtigen, so erzwingt dies zum einen, eine vollstandige Anderungsaufzeichnung (audit trail) aller sicheren Gerate vorzunehmen, und zum anderen, mit dem Rticksetzen, also Aktivieren von G', solange zu warten, bis G keine Transaktionen mehr vomehmen kann.

KG wird den Hauptbestandteil des Zustandes ausmachen, auf den zuriickgesetzt wird. Da das Geriit Gals verloren betrachtet wird, muB dieser Zustand auf einem anderen Geriit 0' von BG installiert werden. 1m Gegensatz zu nonnalen Systemen, bei denen nach dem Riicksetzen der evtl. fehlerhafte Zustand keine Wirkung auf das weitere Systemverhalten mehr hat, ist dies hier, falls BG nicht ganz ehrlich ist, nicht unbedingt garantiert: das sichere Geriite G konnte weiterhin intakt existieren und ennoglichen, den alten Zustand, also Ka, nach dem Riicksetzen auf G' zu veriindem.

Durch die parallele zeitdiversitare Programmbearbeitung und den zyklischen Vergleich aller relevanten Ergebnisse garantiert das System die Erkennung aller aktiven Fehler und somit, daa kein falscher Wert ausgegeben wird. Die passiven Fehler werden durch den vollstindigen gegenseitigen Speichervergleich und viele sich wechselseitig erg- inzende lests mindestens aIle 10 Minuten aktiviert, sich riten gel echnet werden Durch so daa nicht mit gegenseitig verdeckenden Fehlern in zwei unabhingigen Zentralgemu~.

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