Method of end to end verification of primary and secondary...

G - Physics – 06 – F

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G06F 13/20 (2006.01) G06F 11/16 (2006.01) G06F 11/20 (2006.01) G06F 11/30 (2006.01) G06F 13/00 (2006.01)

Patent

CA 2051741

Data bases of a first and second input output processor (IOP), which are primary and secondary slave IOPs, respectively, are synchronized, and communications by a master controller is made only to the first IOP. Each IOP is executing the same tasks utilizing their own clocking systems. A method for periodically verifying that the first and second data base remain synchronized comprises the steps of sending a sync-verify type message to the first IOP. The second IOP eavesdrops on the communications, and when the second IOP recognizes that the message is addressed to the corresponding primary slave IOP, accepts the message. Upon detecting the message is of the sync-verify type by each IOP, operations by each IOP are suspended. A number is generated by each IOP of its own data base, the number being indicative of the contents of the information stored in the data base. A status request type message is issued by the master controller to the first IOP for the number generated by the first IOP, and a status request type message is issued by the master controller to the second IOP for the number generated by the second IOP. Upon receipt of the numbers by the master controller, the value of the number generated by the first IOP is compared to the value of the number generated by the second IOP, thereby determining that the information stored in the first and second data bases are the same when the numbers compare.

Des bases de données d'un premier et d'un deuxième processeurs d'entrée-sortie (IOP), asservis respectivement à titre primaire et secondaire, sont synchronisées, et les communications d'un contrôleur maître sont destinées uniquement au premier IOP. Chaque IOP exécute les mêmes tâches en utilisant ses propres horloges. Une méthode permettant de vérifier périodiquement si la première et la deuxième bases de données demeurent synchronisées comprend les étapes suivantes. Un message de type vérification de synchronisation est envoyé au premier IOP. Le deuxième IOP écoute les communications, et lorsqu'il reconnaît que le message est adressé à l'IOP asservi primaire correspondant, il accepte le message. Lorsque les deux IOP déterminent que le message est de type vérification de synchronisation, ils suspendent leurs opérations. Chacun produit un numéro correspondant au contenu de l'information conservée dans sa base de données. Le contrôleur maître envoie au premier IOP un message de type demande d'état demandant le numéro généré par le premier IOP, puis fait de même pour le deuxième IOP. Lorsqu'il reçoit les numéros, il compare les deux valeurs et, si elles concordent, il établit que l'information de la première base de données et celle de la deuxième sont les mêmes.

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