I am in the process of designing a DR setup for my Exchange 2010 environment, and was hoping for some feedback and/or recommendations. As of now, this is what I have planned:
AD Site A (Primary):
- Mail - Mailbox Server
- Client - Hub Transport and Client Access Server
- Edge - Edge Transport Server
AD Site B (DR):
- Mail-DR - Mailbox Server
- Client-DR - Hub Transport and Client Access Server
- Edge-DR - Edge Transport Server
Both sites are connected by high-speed fibre, so bandwidth isn't an issue. I intend to have the mailbox servers in a DAG for replication.
Does this look right? Do I simply give the DR edge server a higher MX priority so that it only receives messages if the primary edge server is down, or do I still have to worry about potential routing problems? What happens, for instance, if the edge goes down but the HT/CS and Mailbox servers stay online? Since they are up, the databases won't fail over to the DR, which means any mail sent thru the DR edge server won't be delivered (since it's in a different AD site), right?
Anything else I need to worry about?
Also, if I have a failure that takes down the primary Exchange environment but not the site (like a power outage in the server room), will my Outlook 2010 clients automatically fail over to the DR infrastructure, or will they not be able to connect since they're in different sites?