Hello, I can offer some input from my own experiences regarding mounting root. <div class="gmail_quote">On Wed, Mar 26, 2008 at 9:13 PM, Walter Coole <<a href="mailto:WCoole@aperiogroup.com">WCoole@aperiogroup.com</a>> wrote: <div> </div><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"> Please append a correct "root=" boot option I changed the root clause to: root = "/dev/xvda1 ro" , which changed the error to: VFS: Cannot open root device "xvda1" or unknown-block(0,0) Please append a correct "root=" boot option I'm unclear whether the problem is in creating the virtual disk or in being able to mount it after it's been created. </blockquote><div> I found that the default initrd did not contain the xenblk driver and so it could not access the root filesystem. See here: <a href="http://lists.xensource.com/archives/html/xen-users/2008-03/msg00000.html">http://lists.xensource.com/archives/html/xen-users/2008-03/msg00000.html</a> You might even want to use the --preload option of mkinitrd. My exact mkinitrd was: # mkinitrd -v --preload=sd_mod --preload=xenblk --with=xennet --with=xenblktap\ --with=xenbus_be /tmp/test `uname -r` Then I copied /tmp/test to /boot/initrd-2.6.21.7-2.fc8xen.img. This worked for me - YMMV. Cheers, Fred. </div></div>