Referring to Microsoft, Exchange DAG is a high availability cluster for Exchange server. Since Exchange 2010 users are able to cluster up to 16 mailbox servers inside a single DAG. The Active Manager, the management tool for the DAG, replicates the mailbox databases and takes care about the failover and switchover mechanism.
The DAG replicates the mailbox databases between the mailbox servers. The more server are included, the more copies can be shared throughout the DAG group. As typical for a cluster, it also contains a heartbeat, cluster networks, and the cluster database.
|
What is an Exchange DAG (Data Availability Group)?
