Hello!

I am thinking about adding a new server to our already medium-sized cluster, and am wondering if anyone has experienced problems adding a cpanel 11 server to a cpanel 10 version'd cluster?

Any compatibility issues? Transferring accounts? DNS replication?

Everything should go fine.

Upgrade the cluster manager to the latest version (stable) and then add cPanel 11 servers, and you should be fine.

Might want to check cpanel.net forums though, to make sure.