>To date I haven't been able to acquire an off-site storage copy of Zen Server
I'm using the Xen open source product on top of Debian 5 Lenny. Hasn't cost me anything yet. I was running my first DomU a couple hours after downloading the Lenny install CD.
You do need to enable VT virtualization on your BIOS for best results with any virtual machine system.
>The main thing I struggled with on Xen was the % of people using it in production and not just labs...
I figured that if it's good enough to run Amazon's EC3, that's enough credibility to me. I am curious if anyone knows how many DomU clients Amazon runs at any one time, but it's gotta be a lot.
>I think Xen can still only do 1 or 2 (correct?)
Can you clarify the question? 1 or 2 what?
I don't have an Enterprise situation (yet). I'm looking forward to adding a few more 1U machines and maybe moving my storage to a NAS so I can hot-migrate DomU's between machines. So far my management needs have been pretty minimal but it's working great.