Despite the obvious change in configuring a DAG through the Exchange Admin Center versus using the old Exchange Management Console, configuring a DAG in Exchange 2013 is virtually the same as in 2010. However, some improvements have been introduced to this technology, which is worth covering here.
Note
Note that both Exchange 2013 Standard and Enterprise features can be used for DAGs and that a DAG can contain a mix of both. However, each DAG member must be running the exact same operating system, either Windows Server 2008 R2 or Windows Server 2012.
A critical component of any DAG is Active Manager, part of the Microsoft Exchange Replication service, which runs on all Mailbox servers and is responsible for managing DAGs and database copies. While there is only the Standalone Active Manager role for non-DAG members, there are two roles, namely the Primary Active Manager (PAM) and the Standby Active Manager (SAM) for DAG members...