mctrivia: After reading what was below, you said what I was thinking.

It would take some planning, but first you could figure out what is time sensitive vs. what is not.

Waiting room & such can be time sensitive, so if someone was hooked with the #2 server, it would take a little extra time to perform those operations since it would need to check with #1 server first.

Things like discussion boards are not. That is lets say someone posts a message on a discussion board on server #2. At first, give it a temp # (so you don't get a message on both servers with the same ID), then server #2 sends that over to server #1 where it gets the "real" post #. So possible at the most there would be a deal of 10 seconds or so between time the post is made and is viewable to everyone on both servers - but that would not be an issue. (live chat might be - but we don't have that here)

Most games would not be an issue - even though I could see a small issue with those who like to try to play "live" games with very short time limits like 1 hour total time with Fischer clock and such.

Thing is, 95% of the things most players do (play games, read discussion boards) do not require that the main server know about it immediately. That is most everything could be played on the #2 server while it is updating itself with the main #1 server in the background. It could work - but some good planning would be needed.