One of the most awaited (and misunderstood) features added to Exchange Server 2010 is the disaster-recovery/high-availability feature known as the Database Availability Group (DAG.) Microsoft touts it as a perfected “2.0″ of the heretofore painful database replication process known as Continuous Cluster Replication (CCR,) which came into our lives in Exchange 2007. While the DAG does create a much simpler implementation path for administrators, there are some important design considerations that have the potential to create deep, painful “catches and gotchas.” Continue reading Reliable Exchange 2010 DAG: Part 1, Active Directory Health