Date: Sun, 29 Jul 2007 22:22:06 -0700 From: Garrett Cooper <youshi10@u.washington.edu> To: Rakhesh Sasidharan <rakhesh@rakhesh.com>, FreeBSD Questions <freebsd-questions@freebsd.org> Subject: Re: XEN questions Message-ID: <46AD757E.7010602@u.washington.edu> In-Reply-To: <44964.212.72.24.148.1185772449.squirrel@rakhesh.com> References: <62b856460707290755s1225eaffy951caa9c81857de3@mail.gmail.com> <44964.212.72.24.148.1185772449.squirrel@rakhesh.com>
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Rakhesh Sasidharan wrote: >> Does one run XEN inside of freebsd and then VMs inside that, or does >> one run XEN on the bare hardware and then run freebsd inside that? If >> I've already got freebsd running on my box, do I have to reload it >> from scratch or is there a way I can virtualize what I already have >> runing? >> > > Hi, > > Xen runs on the bare hardware and other OSes run atop Xen (i.e. they are > specifically "ported" to the Xen "hardware"). But you don't have to > install Xen on the bare hardware as such. Typically you install Xen on > your OS. And then you install other OSes on this Xen installation. That's > how it works. > > For example: Say you are running FreeBSD 7.0. You install Xen on FreeBSD > 7.0. Then you install FreeBSD 6.2 and NetBSD 3.1 onto Xen. In Xen > terminology, all these OS installations (including the FreeBSD 7.0 on > which Xen is installed) are called "domains". The FreeBSD 7.0 Xen domain > is called dom0 (domain 0). While the FreeBSD 6.2 and NetBSD 3.1 Xen > domains are called domU (domain User). > > dom0 is special coz that's what manages the other domains. Plus, that's > where you install Xen first for it to interact with the hardware etc. Not > all OSes support Xen on dom0. FreeBSD 6.2, for instance, doesn't. (It only > supports domU). FreeBSD 7.0 would, I believe. NetBSD 3.1 does. In Linux, > you need kernel 2.6.18 and greater I think. > > So to answer your question, if you are on FreeBSD 6.2, you can't try out > Xen. You can, however, install FreeBSD 6.2 atop any Xen installation > running on FreeBSD 7.0 and Linux or NetBSD 3.1 etc. > > Hope this helps. :) > > Regards, > Rakhesh > > ps. This should be of some info -- > http://tx.downloads.xensource.com/downloads/docs/user/#SECTION01140000000000000000. > dom0 isn't all the way yet either, though rink@ has said that support might be in 7-CURRENT prior to the first release. We'll see what happens, since he's a busy college student. -Garrett
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