How many ADFS servers should I have for my environment?

HI Guys

I have recently implemented ADFS allowing external company users out on the Public Domain to access our internal CRM platform. We have 1,200 who could potentially connect to CRM over the Internet (not concurrently) but nevertheless I would like to know if I should be considering adding an additional internal ADFS server to sit along side my existing one to support these users?

I have an ADFS Proxy server in the DMZ and just need to know how many concurrent users wold my single ADFS server support before having to consider an additional server.
CTCRMInfrastructure EngineerAsked:
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The answer i found on technet:

What is the difference between a single ADFS server versus a farm? Which one is better?

ADFS can be setup as a

Standalone federation server.
Farm Federation Server using WID
Farm Federation Server using SQL
Farm federation server is definitely a better option than a standalone federation server for the obvious reasons – scalability and redundancy. Standalone federation server only support a single server and only store configuration information on a Windows Internal Database (WID). Of course It is easy to setup and its best for lab environment but lacks scalability and redundancy. Moreover, you cannot add more than one server to the Standalone federation server. However, with a farm federation server, you can start a farm with one single ADFS server and add more ADFS servers to the farm at that time or sometime in the future. I often get this question, can a farm federation server using WID function with one server? And the answer is YES! But remember you cannot benefit from load balancing and redundancy since there is only one server in the farm. For more information on Federation Server using WID or SQL please refer to the question of which database to choose.

But this answer is clear. If you are running a critical service like auth you always should have a solution for any desaster.

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