I currently have two sites where one is just a spoke that talks back the exchange server at the main site. Luckily I'm finally getting some bandwidth between the two and I'm trying to figure out a good way to have HA over the link.
We currently use Exchange 2007 and are looking at moving to exchange 2010 so I thought this was a perfect time to think about this. I've been doing some reading on DAG and I find it very interesting.
My issue comes down to that each site has its own active directory site but currently the spoke site uses outlook anywhere and doesn't really use their domain for anything except login.
My main qusetions is if I manage to have two servers, one sitting at site 1 and one at site 2, one is going to be a passive server and the other is going to be an active? So if site one goes down, do I just have another mx record with a different priority? So that when DAG notices it will kick on the server and start to respond?
We already have a secondary mailserver holding our mail but I'd like for a quick response as email is our current lifeblood for many of our products.