I need to get 400 users on the Internet with a pair of ASA5520's for high availability. If I get two 250 user models will this work? I figure that when both boxes are working each should have approx 200 users. If one fails then I understand all users will not be able to get on. However, when both are up I would like to have a total of 500 slots available. My concern is that somehow the A/A setup will limit me to the amount of user on one box which would be too low. If this is the case then I would have to purchase two 500 user models which may not be financially possible.
Any ideas of how this would work?