A cool new feature in Exchange 2010 is the Database Availability Group (DAG). With this feature you can put a copy of your mailbox database on multiple mailbox server (max 16.). The Database Availability Group uses the Windows Failover Clustering feature and you can manage everything through the Exchange Management Shell (EMS) and the Exchange Management Console (EMC). Let’s have a look on that…
This is my Exchange 2010 environment:
Server 1 – SRV-EXDC-01
OS: Microosft Windows 2008 R2 Enterprise x64
IP: 172.16.1.10
Roles: Active Directory, DNS
Server 2 – SRV-EX10HT-01
OS: Microsoft Windows 2008 R2 Enterprise x64
IP: 172.16.1.11
Roles: Exchange 2010 HT/CAS
Server 3 – SRV-EX10MB-01
OS: Microsoft Windows 2008 R2 Enterprise x64
IP: 172.16.1.12
Roles: Exchange 2010 MBX
Server 4 – SRV-EX10MB-02
OS: Microsoft Windows 2008 R2 Enterprise x64
IP: 172.16.1.13
Roles: Exchange 2010 MBX
1.) First I’ve created 2 new mailbox database on each mailbox server.
SRV-EX10MB-01 - MD01, MD02
SRV-EX10MB-02 - MD03, MD04
2.) The next step is to create a new Database Availability Group.
Groupname: DAG01
Witness Server: SRV-EX10HT-01 (Could also be a another server, but not a member of the DAG!!)
Witness Directory: C:\FSW_DAG01
3.) After succesfully creating the DAG, we can added some mailbox servers to it
SRV-EX10MB-01 and SRV-EX10MB-02
4.) The Windows Failover Clustering feature will automatically installed on each Mailbox server
5.) Give the Database Availability Group an IP address. This can be done with the following command:
Set-DatabaseAvailabilityGroup -Identity DAG01 -DatabaseAvailabilityGroupIpAddresses 172.16.1.50
6.) The next step is to add a Mailbox Database Copy
7.) The copy of the Mailbox Database will be copied to the other mailbox server. As you can see, Mailbox Server SRV-EX10MB-02 is now also containing Mailbox Database MD01 and MD02
8.) Login through the Outlook Web App with a user in Mailbox Database MD01
9.) Disable the LAN connection on Mailbox Server SRV-EX10MB-01 (fake a failover!)
10.) You’ll now receive an error in your Outlook Web App, this is normal, because the active mailbox is unavailable!! Wait a copple of seconds and click another e-mail message! As you can see, the passive Mailbox Database copy is now become active!! cool…. 
11.) After enabling the LAN connection on Mailbox Server SRV-EX10MB-01, the copy status become Healthy again!
12.) You can also test the “Fail Over” manually. Right click on your Mailbox Database, choose Move Active Mailbox Databse, and select the new active Mailbox Server.
So….after all, a copple of seconds downtime for the users!
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