[PVE-User] Recommended root partition size

[Yılmaz Bilgili]

Hi All,

I am setting up a new PVE 2.0. I have total 600 GB of raid storage. 
4*300GB raid 10 + 1*300GB hot spare.

I will run 1 pfSense, 1 Windows 2008 + SQL, 1 Windows DC + File server 
as guest. (maybe +1 debian for back up purposes)

If I go with setup defaults I have 410 GB of pve-data, 100 GB of root 
and others...

My questions are,

How Proxmox setup decides size of root partition?

Do I need 100 GB of root partition?

How big you recommend?

Thanks in advance.

Regards.