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Exchange 2010 DAG Design Question

cajx
cajx asked
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Last Modified: 2013-01-04
Let's say at site A, I have one server with Client Access and HUB roles. Another server is the mailbox store server.

At site B, I have one server with a mailbox store role and the minimal role required for that site to function (is it Client Access or HUB?).

Now if I set up a DAG so that site B has a copy of all the databases from Site A's mailbox server, and Site A goes down, what do I need to do with exchange to be back up and working at site B (besides make it active in exchange, and the external DNS and firewall type stuff)?

Do I simply need to install one more exchange server there? If that's the case, then can I put all 3 roles at Site A and Site B so that I'd have a better DR scenario?
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It makes sense that all roles would be needed if site A goes down... but I was under the impression that one of the roles could only be 1 per enterprise. As in, you'd have to build it from scratch in a DR situation. Obviously there must be a way to do it then. Thanks.

I don't think I'm using OL because I'm not sure what that is. Clients use Outlook 2010, Blackberries (BES), iPhones, and Androids.

edit: Wow, does OL just mean Outlook? Funny, it didn't occur to me before.

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