First Details of Exchange Server 2010 Service Pack 1 Available!
We've also made improvements to the Exchange Management Console (EMC) and the Exchange Control Panel (ECP). For example, one of my favorite changes is in there - new GUI property fields for database availability group (DAG) IP addresses and alternate witness server and alternate witness directory settings:
New High Availability Features in Exchange 2010 SP1
Enhanced datacenter activation coordination support
Exchange 2010 RTM includes a special mode for DAG site resilience support called datacenter activation coordination (DAC) mode. In DAC mode, Exchange cmdlets can be used to perform a datacenter switchover. In the RTM version, DAC mode is limited to DAGs with at least three members that have at least two or more members in the primary datacenter.
In SP1, DAC mode has been extended to support two-member DAGs that have each member in a separate datacenter. DAC mode support for two-member DAGs leverages the witness server to provide additional arbitration. In addition, DAC mode has been extended to support DAGs that have all members deployed in a single Active Directory site.
So basically in SP1, you can now use DAC mode for all DAGs with two or more members.
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