How many simultaneous connections are possible to an OpenVPN server?

Question

openvpn

OBJECTIVE : to build an expandable VPN network, it is balanced to split server capacities.
The following server configuration [units] is available:
-- Dedicated --
CPU - AMD Hexa-Core 6 Cores x 2.8 GHz (3.3 GHz Turbo Core)
RAM - 16 GB DDR3 ECC
HDD {SSD RAID 1} - 1.000 GB ( 2 x 1.000 GB SATA)
LAN - 100 Mbit/s (traffic is not limited)
------------------
QUESTION :
1) does it make sense to use virtualization (KVM, OpenVZ, OpenStack) ) for balancing and extensibility;
2) how many simultaneous connections are possible to the OpenVPN server without loss of transmission speed for a similar configuration using one unit as an example?
3) which way to go: analogues of Pritunl with an API for managing an OpenVPN server (trust in a commercial product) or elementary Docker containerization with script binding.

Answer 1

1. If the north is intended only for the openvpn role, then virtual machines will only give an overhead. 2. The number of users is not an indicator at all, there can be as many as you like. You will run into either the channel width (copper or optical port), or the CPU when encrypting. If you do not rest, then there are at least a million users.