| 摘要 |
Data bases of a primary and secondary slave IOP are synchronized,with communications by a master controller being made only to the first IOP. To periodically verify that the first and second data base remain synchronized, a sync-verify type message is sent to the first IOP and, as the second IOP eavesdrops, operations by each IOP are suspended. Each IOP generates a number being indicative of its data base contents. A status request type message is issued by the master controller to the IOPs when a comparison of these two numbers, and hence the contents of the data bases, is required. <IMAGE> |
