When you enter the write standby command on the active unit, you force the entire configuration to memory on the standby unit. The configuration replication does a "memory-to-memory" copy. Once this completes, you need to issue a write memory command on the active unit in order to write the configuration into the Flash memory of the standby unit. Both "sync started" and "sync completed" console messages are displayed during this operation. Large configurations can take awhile to transfer. If a switchover occurs during replication, the new active PIX has only a partial configuration. The unit then reboots itself to recover the configuration from the Flash or re-sync by the other unit.
