[Enginerrrd]

Which hypervisor are you using for that? I used to run Xen for a similar purpose, but I ended up just running normal debian with a bunch of lxc containers instead after dealing with some Xen issues that were difficult to unravel.

[epitactic]

ESXi (free version), it works well though if I had to do it again from scratch today, I'd probably go with KVM

[Datagenerator]

Tried Proxmox?

[NexRebular]

Or SmartOS?