Doubts

Hi All.

I'm studying to retry VCAP Design 6.5 (I did not pass in the first time), and I've some doubts about some topics that I can't understand well, even reading the technical docs. I appreciate anyone that can help me:

1. If I have 2 Data Centers, each one with a vCenter instance, and I'd like to migrate both to vCenter 6.5, but now using a SINGLE SSO DOMAIN, what is the correct migration path? And what is the correct method if I decide to keep with 2 SSOs, and link them with Enhanced Linked Mode?
2. VCSA could be upgraded using Update Manager? Or will be a manual operation? Because I know Update Manager can upgrade Virtual Appliances, but I'm not sure if VCSA is included.
3. SQL Servers with Always On Availability Group supports vSphere Snapshots?
4. The best configuration for a VM, considering performance is allow VM to run in the same physical node, avoiding non-local memory access. But, how I can find the physical NUMA capacity? Sometimes I just know the CPU and Memory resources available in ESXi host (Ex: 2 physical processors with 10 cores per processor and 128 GB of RAM), so how I can figure out the capacity of the each NUMA node? If I understand well, I need to split memory capacity by number of physical CPUs (that means, 128/2 = each node with 1 PCPU, 5 LCPUs and 64 GB of RAM). Am I correct?
5. How I configure my VM to achieve the best performance in each NUMA node?
6. I read again the topic about functional and non-functional requirements, and the first one is more like "business" requirements and the second one is technical requirements, that means, what the design NEED TO DO and HOW WILL DO. That's it?

Thank you!

Valter Junior