| 摘要 |
Disclosed is a method and apparatus for causing CPUs comprising portions of a fault tolerant process group to operate in an active-standby mode when synchronizing newly on-line CPUs and reverting to an active-replication mode when synchronization is complete. The above is accomplished in one embodiment of the invention by continuing to operate the primary processor in the active-standby mode and updating the newly online CPUs in accordance with a single pass intelligent update algorithm. When synchronization is complete, a message is transmitted to all CPUs in the group causing a reversion to an active-replication mode for all CPUs whether primary or standby. Any already synchronized CPUs that were in a standby mode, when the group is switched to an active-standby mode, are only updated by check-point message data as data synchronization updating record messages being supplied to a newly online CPU are ignored by these already synchronized standby CPUs.
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