The specifications I posted are an expansion for an existing system.
I looked at the server range. I did not consider anyone installing Windows 10 on server grade components.
Supermicro 846E26-R1200B case/backplane.
Supermicro X11SPH-NCTF Motherboard attached to the backplane.
The components are certified server grade components.
The server running Windows 10, is running at maximum of 50% potential, probably more like 20% potential.
Factor in Dual LAN with 10GBase-T with Intel® X722 + X557
Windows 10 is a desktop operating system. Windows networking is designed for one user, not multiusers.
I am surprised Windows 10 has not Blue Screened.
As others have pointed out, the method described for hard drive sharing is wrong.
I am a hardware person. I deal with manufacturer's datasheets and application notes.
Software I just install, follow the application notes.
If I was in your position, I would install Centos server and reformat the hard drives for maximum efficiency.
It requires removing all the hard drives, transferring the data from a Windows computer to the server.
There is work involved. Long term you will have an ultra stable server designed for continuous 24/7/365 operation.
Centos server is RedHat server without the commercial software and support.
Centos Forum: CentOS - Index page
Why Centos? RedHat is a billion dollar corporation with many high profile manufacturer's using the software. You could use others. In a server situation, I would use the most stable, reliable, best supported not the latest release.