I saw a couple of questions recently about what kinds of servers you can group together in a server pool.
"Can I create a server pool with different types of servers, like T4 and T5, or T4 and M10?"
Yes, you can. As long as you're not trying to mix SPARC and x86, you can put different types of hardware in a server pool.
"Is it a good idea to make server pools like this?"
It will work, but performance won't be quite as good. To enable migration between hardware, the cpu-arch property needs to be set to generic, which means that not all of the hardware features are used. If you have the hardware to build completely homogeneous server pools, you'll get better performance.
The Server Pools chapter explains how to set up a server pool for whatever virtualization type you're using.