Are you using non-VMWare Virtualization in prod/serious testing?

[riddlermarc]

There are loads of threads of people using ESX (now ESXi too) but I'm just wondering if anyone has been brave enough to standardise on Xen, Hyper-V etc?
We use ESX at work (it just works, doesn't it) but I'm an OSS man and would love to hear any stories of people using Xen (not necessarily Xensource) and how they managed to get it into either production or a decent testing environment?

I know the bosses are wary of anything that isn't covered to the nth degree by a support contract and tend to play it "safe"..

 

[riddlermarc]

We use Xen (3.1) in production to provide basic Linux VMs. It offers great performance + isolation. Having said that, KVM will take it's place soon with a major benefit being that it's part of the mainline Linux Kernel.

Possibly going OT but I was reading this page just yesterday: Prediction: Citrix will drop the open source Xen hypervisor for Hyper-V. The rest of the open source world drops Xen for KVM. - plenty of ifs & buts, light on facts but it does make an interesting read..