Hi, Chris. We?ve only enabled AirGroup for 4 buildings on campus, but we did see a considerable increase in Radius traffic as a result. I have the same concerns if we were to deploy this campus-wide. Across the board, we?re seeing well over 300 requests per minute, but that doesn?t concern me. It?s the requests per second that I watch, as I believe the 25Ks were rated at or above 300/second. On my busier servers, I?m hovering around 20-30 requests per second. We have 4-6 25K servers handling radius requests. Peak days have seen 4.6M authentications. Hopefully this gives you a useful comparable.
Oh, and we?re on 6.2.5, which is much better than 6.1.x. However, the database received an overhaul in 6.3.x and is supposed to be MUCH faster. I will be upgrading to 6.3.2 once it?s released and I receive a green light from Aruba.