Database Availability Group Design Examples: Exchange 2010 Help: "
A two-member DAG is the smallest possible DAG that can provide high availability. Two-member DAGs are best suited for organizations that require some form of high availability for mailbox services and data, but that don't require site resilience. This configuration works especially well in small office and branch office deployments because it enables redundancy for the Client Access, Mailbox, and Hub Transport server roles using only two Exchange servers. The following figure illustrates this configuration.
Two-member database availability group
Two-Member Database Availability Group
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