Wanted to provide an update on what I ended up doing
- I decided that advice of not putting all of the eggs in the same basket (building super-server to do everything I want) was a prudent one and focus on risk segmentation/management. As such data would be on NAS devices that would serve data and nothing else. Virtualization would run on its own hardware which would be powered up/down as needed, and domain controller would have its own server vs being a also a NAS and virtualization server.
as such
- went and purchased DS216J to become 'primary NAS' and complement existing DS115j. Once fully set up, the intent is to have two active copies of the data on each NAS, have automatic copy/sync, plus USB3 HDD backup of data. data will not stay on server or anywhere else. have not decided whether I would segment NAS into utility VLAN with other devices like HDHR, Obihai, etc or keep within windows domain VLAN
- bought qotom mini server (
https://www.amazon.com/gp/product/B00XOK93BU/?tag=snbforums-20) with 4 GB LAN ports and Celeron 3215U processor to act as domain controller. the hardware itself was $140, add taxes, shipping, customs duties, plus 8 GB of RAM and 250 GB msata drive I am slightly under $300 for small factor, small power consumption dual core from 2016 with RAM extension capabilities (up to 16 GB) . Once here, I would install Windows 2012 Essentials in migration mode and move DC role to that hardware demoting old server (i7-3770k with 32 GB of RAM)
- old server would become dedicated virtualization lab to host existing VM and other trial software I want to work with for things like certification/training (primarily Microsoft Server 2016 + SQL Server 2016 RDBMS). it would leave in separate VLAN from "my" machines as nothing I would do in virtualization lab would either need access to my resource or contain my data
I have not yet picked the hypervisor (Hyper-V or VMWare option) as I am still reviewing limitations of "free"/home additions - likely in one months once Microsoft fully releases Windows Server 2016 to see what is new in Hyper-V and how buggy that staff is.
Thank you for all of the earlier help!