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Sicherung von Systemdaten
(Back-up)
1. Wie das IRC Back-up-System arbeitet
Das IRC System enthält ein System zur Datensicherung (Back-up).
Eine der Satellitenkassen kann zu einem Back-up-Master deklariert werden.
Wenn sowohl die Masterkasse, als auch der Back-up-Master normal arbeiten, läuft das System in den
folgenden Schritten ab:
1) Jede Satellitenkasse sendet aktualisierte Tisch-Daten (und Bedienerdaten*) an die Masterkasse.
2) Die Masterkasse empfängt die Daten, und sendet das Empfangsbestätigungssignal (ACK-Signal)
an die Satellitenkasse.
3) Die Satellitenkasse sendet die aktualisierten Daten an den Back-up-Master.
4) Der Back-up-Master empfängt die Daten und sendet das Empfangsbestätigungssignal an die
Satellitenkasse.
*Nur bei zentralisiertem Bedienersystem
Falls die Masterkasse ausfällt, fungiert der Back-up-Master als Masterkasse, nachdem sie zur
Masterkasse ernannt worden ist. Falls der Back-up-Master ausfällt, kann die Übertragung aktualisierter
Daten an den Back-up-Master gestoppt werden, indem die Masterkasse zur Masterkasse ernannt wird.
Wenn die Masterkasse oder der Back-up-Master wieder zur Verfügung stehen, übernehmen sie ihre
Aufgaben als Masterkasse oder Back-up-Master durch den Deklarations-Vorgang „Wiederherstellung“.
1) aktualisierte Daten 3)
aktualisierte Daten
2)
Empfangsbestätigungssignal
4)
Empfangsbestätigungssignal
Satellitenkasse
Back-up-Master
Masterkasse
4
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