<div class="gmail_quote">On Wed, Jan 21, 2009 at 2:48 PM, Mark McLoughlin <<a href="mailto:markmc@redhat.com">markmc@redhat.com</a>> wrote: <blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"> (This is all getting offtopic for fedora-xen, we should really move to fedora-virt) On Wed, 2009-01-21 at 14:28 +0100, Jan ONDREJ (SAL) wrote: > virtio_net works well, but I have trouble to boot from virtio_blk. > > I can add second disk as virto block device, but I can't boot from > first disk. When switching from IDE to virtio, you need to first build a new initrd in the guest with e.g.: $> mkinitrd --with virtio_pci --with virtio_blk -f /boot/initrd-$(kernelversion) $(kernelversion) You only need to do this once. After that, if a new kernel is installed while you're booted off a virtio disk, then mkinitrd will include the modules automatically.</blockquote><div> You will also need to specify /dev/vdX on the kernel root= line and make sure your init script inside your initrd triggers the virtio drivers at boot so that the /dev/vdX are created. </div></div>-- Emre