Approx 25,000 users + openfire

Hey there I would like to have a setup that can support roughtly 20,000 - 25,000 users.

I am looking at this page (http://www.igniterealtime.org/community/docs/DOC-1543) and see that the requirements are “At least 1.5 GB of available RAM, two 3 GHz processors, and one connection manager on the same machine.”

on the linked connection manager page it says the connection manager can only support 5000 concurrent users.

My questions are basically

  1. What is the recommended number of machines and connection managers to really support 20,000 - 25,000 users. Does anyone out there have a real world experince in this.

  2. What are the hosting companies out there that can support such a setup. Give your recommendations.

Regards.