There are two methods of doing what you're wanting to do. The plesk "official" way would be to add the domains through the Plesk Control Panel and set their nameservers as "Slaves". This, of course, would require some work in the DNS Configuration of the server (Server -> DNS -> common transfer line...)
The slightly harder, but much cheaper way, would be to add zones into the named.conf file for the second server. Something along the lines of...
zone "yourdomain.com" {
type slave;
file "/var/yourdomain.com.hosts";
masters {
ip.of.server.1;
ip2.of.server.1;
};
};
Then, on Plesk, you'd have to add the nameservers (configured of course for server2). ns3... and ns4... to the dns records for the domain(s) in question. Note: This is where the DNS Template would come in handy, if you plan on doing this for more than one.
Although there are some integration problems with Webmin (
www.webmin.com) and Plesk, Webmin can be a useful tool to someone with very little knowledge in some areas.
What you're looking for will take a bit of configuration. I'm willing to help you, walk you through the steps directly, etc., should you desire that type of assistance. You can drop me a privmsg via the site and we can set up a time to go through it. I don't mind helping, I just want you to know the things you'll need to know about updates..
Just something to remember: Plesk updates the configuration files automatically. Changing them directly (i.e. httpd.include for any domain) will do absolutely no good. Likewise, when updating Plesk (7.x.x -> 7.x.x+1), you'll loose some of the configuration in your named.conf. I suggest you backup any changes you made (nameservers, etc) prior to doing updates, which is actually easy as well. An alternative would be to use a second configuration file for named, but that's a bit of work in itself.
So back to the subject at hand... If you'd like some assistance with this through Plesk, I can help you out there. If you'd rather use a cheaper alternative, I can help you there too. I look forward to helping you in the future, should you desire to take a lended hand.