First, it think it's fantastic that the Fedora Project is considering bundling a Xen enabled kernel. I know it's only in development now and likely not etched in stone yet, but nevertheless ... cool. But I have a few questions, some of which I have educated guess about the answers. I post them mostly here for discussion, as I suspect that some things are undecided or unexplored. 1. Uh ... so where are the Xen control tools? I suspect these are forthcoming, I just wanted to double check. 2. On a somewhat related note, Red Hat at one time bundled a UML kernel but later stopped (even in an errata kernel for that same release). What were the reasons for this? 3. I know some basic differences between UML and Xen, but I'm wondering about the differences in mindshare. How much 'industry' buy-in does each have? I note that Xen has some support of both HP Labs and Intel Research Cambridge. 4. Any idea if it will show up in a future version of RHEL as well? 5. On the technical side ... are the changes to the domain0 kernel running on the raw hardware non-intrusive enough that it may one day become feasible and/or desirable to just ship the standard kernel as a Xen-enabled kernel? 6. What is the likelihood that Xen will be included in Linus' kernel someday? Has anyone solicited Linus' opinion on Xen? I'm curious because that would mean *two* virtualization technologies that could potentially interfere with one another, or at least be mutually exclusive at build time. Not that it would matter much from a practical end-user perspective ... if you really want to run a bunch of Xen domains within a UML ... I suppose there are worse ways to torture yourself ;-). 7. What do people think of the idea of porting Anaconda to run under Xen so that you can install a full release of Fedora Core (or RHEL) as an unprivileged guest the way you would normally install the OS? I'm not exactly volunteering, but I did *almost* have the installer booting within UML and start to install Red Hat Linux. It bombed out at some point. Can't remember where. I did it all without hacking any python, IIRC. -- -Paul Iadonisi Senior System Administrator Red Hat Certified Engineer / Local Linux Lobbyist Ever see a penguin fly? -- Try Linux. GPL all the way: Sell services, don't lease secrets