this is Ben from the Univention Sales team here. I hope I can help.
The subscription is charged per physical server operating UCS simultaneous. What does that mean, especially if you run UCS as a virtual machine (VM) in a cluster?
Let me give you two examples:
a) 2 physical hosts with 7 UCS VM’s:
Only two server are charged.
b) 2 physical hosts with 1 UCS VM:
Only one server is charged.
Please note, if you use UCS as a Active Directory-compatible Domain Controller, for Printer -, share- and DHCP management or RADIUS you need the UCS Domain Services which are charged per user or client (you can choose) in addition to the subscription per server.
I hope, I was able to answer your question. If not, don’t hesitate to come back to me here in the forum or per email, if you want me to make you a concrete price information for your setup.
The prices and details can be found at the price website, which you probably found already.