What are the requirements for Ejabberd to run? What are the recommended requirements for a high-volume server ( alot of users) ?
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What are the requirements for Ejabberd?
Some partial answers
The software requirements are listed in the ejabberd Guide.
The hardware requirements vary depending on the usage. ejabberd tends to consume few CPU, and a lot of RAM.
You can take a look at some public big Jabber servers that run ejabberd:
Note that both jabber.org and jabbim.cz use PostgreSQL database storage.
You can ask in the ejabberd mailing list; maybe administrators of big ejabberd deployments give you more details.
A very very old benchmark is still available here: