[dgl]

They started out with User Mode Linux actually, before Xen even existed.

[dasmoth]

Indeed -- and stuck with it for quite some time. They were trialling Xen for some time, but I don't think they ever deployed it on a terribly large scale. Certainly, my VM went straight from UML to KVM.

[pwaring]

I believe the management tools for Xen (or lack thereof) were the reason for using KVM instead. None of my machines (I have 7 or 8) have ever used Xen.

[evangineer]

Thanks for the catch, I had forgotten that they were a UML shop.