Deploying High Availability and Site Resilience: Exchange 2010 Help:
"Overview of the Deployment Process
While the actual steps used by each organization may vary slightly, the overall process for deploying Exchange 2010 in a highly available or site resilient configuration is generally the same. After performing the necessary planning and design tasks for building and deploying a database availability group (DAG) and creating mailbox database copies, you would:
1. Create a DAG. For detailed steps, see Create a Database Availability Group.
2. Add two or more Mailbox servers to the DAG. For detailed steps, see Manage Database Availability Group Membership.
3. Configure the DAG properties as needed:
1. Optionally configure DAG encryption and compression, replication port, DAG IP addresses, and other DAG properties. For detailed steps, see Configure Database Availability Group Properties.
2. If the DAG contains three or more Mailbox servers that are deployed in multiple Active Directory sites, Datacenter Activation Coordination (DAC) mode should be enabled. For more information, see Understanding Datacenter Activation Coordination Mode.
3. For detailed steps about how to create a DAG network, see Create a Database Availability Group Network. To manage a DAG network, see Configure Database Availability Group Network Properties.
4. Add mailbox database copies across Mailbox servers in the DAG. For detailed steps, see Add a Mailbox Database Copy.
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