No. of Shibboleth servers required for 6, 00, 000 users to authenticate.

[Nate Klingenstein]

Dematri,

I am looking for an article that suggest the ideal no. of users supported by
a Shibboleth server and based on it increase the no. of servers required to
handle the immense authentication request.
Any pointer will be of great help.

This depends heavily on what you want to do for each request, and the more important variable is logins per second rather than total userbase.  Some general numbers using EC2 can be found at:

https://wiki.shibboleth.net/confluence/display/SHIB2/IdPProdLoadTestResults

Others are more than invited to add to that page, but our general guidance is, "you have to load test it".

Hope this helps,
Nate.
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