We are discussing internally to moving our current single NPS server to multiple NPS's with 2 NPS proxies.
The reasoning behind this has mostly been to increase redundancy. However I have been curios if we even need to go that route because no one is really sure if our existing NPS server is overloaded or not. So I began running performance monitor and tracking the "NPS Authentication Server" counters. I collected data for 4.5 hours on a typical data and these are the numbers I got. I'm wondering if these are normal or extremely high for our environment.
~120 access points spread over 6 buildings.
~1000 users on wireless at any given time
NPS is running on 2008 R2, all DC's are 2008 R2.
NPS Data (4.5 hours runtime)
Access-Challenges/sec - avg = 1.5, max = 45, total = 2,339,207
Access-Requests/sec - avg = 1.7, max = 51, total = 2,672,590
Access-Accepts/sec - avg = .198, max = 6, total = 325,000