Exchange 2010: High Availability with DAGs

Automatic Database TransitionsThe replication service monitors database health to ensure that active databases are properly mounted and available and that ESE has signaled no I/O or corruption errors on a server. If an error is detected, the replication service notifies Active Manager, which begins the process of selecting the best possible available copy, then makes that copy active to take the place of the failed database. To make its choice, Active Manager creat...