Download Das OSF Distributed Computing Environment: Grundlagen und by Alexander Schill PDF

By Alexander Schill

Das allotted Computing setting (DCE) der Open software program starting place (OSF) stellt eine Reihe von Softwarekomponenten bereit, um die Erstellung verteilter Anwendungsprogramme auf Rechnernetzen zu erleichtern. Dem Leser wird ein praxisnaher Überblick über OSF DCE vermittelt und konkrete Hilfestelllung beim Einsatz dieser Systemumgebung geboten. Neben der detaillierten Darstellung der einzelnen Komponenten werden auch konzeptionelle Grundlagen erläutert, um das Verständnis auch ohne weiteres Spezialwissen zu gewährleisten. Graphische Illustrationen, tabellarischer Vergleich wichtiger Grundkonzepte, Programmbeispiele, Informationen über Produkte und Systemlösungen, sowie Index und Literaturverzeichnis erhöhen den praktischen Nutzen des Werkes.

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Additional info for Das OSF Distributed Computing Environment: Grundlagen und Anwendung

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Die Replikation eignet sich primiir fiir biniire Systemdateien, die sich nur mit neuen Betriebssystemversionen iindern. Caching: Ein zugreifender DFS-Client hiilt sich gesamte Dateien bzw. groBe Teile davon in einem lokalen Cache. Dadurch ist ein sehr effizienter, lokaler Zugriff bei umfangreichen Bearbeitungsvorgiingen moglich. Ben einer Datei sichtbar. Recovery: Durch ein Log-basiertes lokales Dateisystem der DFS-Server werden Dateikommandos aufgezeichnet. Dadurch ist es moglich, nach einem Rechnerausfall schneller wiederaufzusetzen, indem die Kommandos seit dem letzten Sicherungspunkt wiederholt werden.

Ferner wird der Security Service von CDS verwendet, urn Authentisierung und Autorisierung beim Namenszugriff zu gewiihrleisten. AuBerdem setzt er den Distributed Time Service ein, urn Namenseintriige mit global konsistenten Zeitstempeln versehen zu kannen. Der Time Service verwendet CDS, urn andere Time Server zu lokalisieren, sowie den Security Service, urn die Server gegenseitig zu authentisieren. Der Security Service wiederum setzt den Distributed Time Service ein, urn Zugriffsberechtigungen mit konsistenten Zeitstempeln zu versehen und deren Giiltigkeit auf einen bestimmten Zeitraum zu begrenzen.

Dies muB nicht zu einer Verklemmung fiihren, da Server neu eintreffende Aufrufe nebenlaufig zu schon laufenden Aufrufen durch mehrere Threads bearbeiten konnen. B. Zwischenergebnisse einer umfangreichen Berechnung vorab zuruckzuliefern. Dazu muB der Client aber auch eine entsprechende Prozedurschnittstelle anbieten. Der Remote Procedure Call des DCE 43 Arten des Datentransfers 1m Rahmen von RPCs werden Daten normalerweise als Wertparameter ubergeben. B. umfangreiche Daten auf extemen Speichermedien) steht auch ein spezieller Pipe-Ubertragungsmodus zur Verfiigung.

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