how to setup nameservers

[ephigenie]

Yes you need 2 Servers minimum to have 2 independent DNS Servers.

If you use ispCP as well on the 2nd Server, you need to take care that you're not overwriting the domains vice versa... so the scripts need to be adjusted so every server is fetching the domains from the other one - and creates entries in the bind conf if not already existant.

But without overwriting the ispCP (new) zones of course ...