Microsoft Licensing

Buy Data Center - Unlimited VMs per host.

If you want more advice, please be more specific.

Thanks Lee.

E. g. Running with 3 Hyper-v nodes with Cluster enabled. for 15 VMs.

For that many VMs since licenses cannot be transferred between hosts more than once every 90 days, Data Center is what I would strongly recommend.  Otherwise, you need 8 licenses per host.  to support 15 VMs.  It might be SLIGHTLY cheaper to go with standard today... but add a couple more VMs and you're now paying as much or more than Data Center.

EXCEPTION - you're still not being clear - 15 VMs of what?  Linux?  Standard is fine.  Windows?  Data Center!  (Microsoft doesn't license per VM - it's per Windows Guest OS).

Hello

I share the same opinion of Lee,
Windows licenses are by operating system and not by VM.

Also everything depends on the Windows server version that you have installed, whether Standard or the simplest Datacenter, being the most powerful, since you can run many virtual instances in your environment in an unlimited way.

Also the hardware components of your physical host play a very important role depending on how many vm you want to deploy in the future.

What version of Windows server do you have? 2012, 2016, 2019? , standard, or datacenter?

regards..