Can anyone help on the server configuration required for handling 50,000 concurrent user?

Hi All,

This is Manoj, I have worked with openfire with small no. of users. Now I want to configure the same for more than 1Lakh users, where I need to access 50,000 concurrent users, can anyone help me out for the server configuration for the same. Such as Core, CPU, Processor, RAM and HDD.