Need to create
Create DAG in Exchange server 2010 for failover in Mailbox *over at mailbox database level
Description: The Database Availability Group (DAG) is the new high availability solution in Exchange 2010. None of the clustering technologies in 2007 is valid in 2010. A DAG is a collection of up
to 16 mailbox servers with a maximum of 16 copies of each database. It makes
the database independent of any server and gives us fail-over on a mailbox level rather than a hardware or storage group level as in 2007. To illustrate it, if one
database gets corrupted or the disk having the files fails, you can quickly mount a copy of the same databasein any of the servers which is part of the DAG.
Steps to configure DAG:
Add-DatabaseAvailabilityGroupServer –identity HEWDAG –MailboxServer E14Node1
As you can see
, the shell installs Windows Failover Clustering as part of configuring the server to be a member of DAG. You don’t have to install clustering before hand as the process will go ahead and install
if it is not present. This is good for administrators who are not that comfortable with configuring the cluster themselves, like CCR in 2007.
Add-DatabaseAvailabilityGroupServer –identity HEWDAG –MailboxServer E14Node2