You're looking at it wrong. If you have two servers, why not use them all of the time instead of just during a failure? Load balancing makes sense. If you need to take one down for maintenance, or if one fails, you're still using the other. And - each only has to deal with 1/2 the load when both are online.
However
If they are in different sites then I wouldn't want load balancing so could I have just 2 servers running SCR with all mail flowing through the live site and the DR site only used if we lose the live server. I assume both servers would have to run CAS. Am I on the right track?
Thanks for the link, one question see the following:-
Regardless of their geographic location relative to other DAG members, each member of the DAG must have round trip network latency greater than 250 milliseconds (ms) between each other member.
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