> From: David Della Vecchia
> Subject: Re: [Xen-users] ubuntu and debian guests cannot find or mount
> root partition
> To: Mike Viau
> Cc: xen-users@xxxxxxxxxxxxxxxxxxx
> Message-ID:
> <CAEGWhjGRkn619ZR9eQv77_=qGVg3dwKzuHem7Rzs8OehLBgOVg@xxxxxxxxxxxxxx>
> Content-Type: text/plain; charset="iso-8859-1"
>
> On Thu, Nov 10, 2011 at 1:15 PM, Mike Viauwrote:
>
> > On Thu, 10 Nov 2011 15:42:03 +0000 <adamgold> wrote:
> >
> > I've recently installed xen 4.1 but am having problems getting the guests
> > up and running (I'm using ubuntu 11.10 for dom0 and have tried the same
> > distro plus squeeze for guests). It seems they can't find the root
> > partition. I've left most of the defaults in xen-tools.conf, just changing
> > the name of the volume group (I'm testing
an lvm installation) and used the
> > debootstrap creation process. I went through the following steps:
> >
> > 1) xen-create-image --hostname vm1 --role=udev --ip=[ ]
> > 2) xm new /etc/xen/vm1.cfg
> > 3) xm start vm1
> >
> > After I started the guest and connected to the console it dropped to a
> > busy box shell. Here's the last part of the output prior to the bb shell
> > (I can provide more):
> >
> > =================================================
> > [ 0.277228] EFI Variables Facility v0.08 2004-May-17
> > [ 0.277490] TCP cubic registered
> > [ 0.277613] NET: Registered protocol family 10
> > [ 0.278147] NET: Registered protocol family 17
> > [ 0.278168] Registering the dns_resolver key type
> > [ 0.278282] registered taskstats version 1
> > [ 0.288490] Magic
number: 1:252:3141
> > [ 0.288517] /build/buildd/linux-3.0.0/drivers/rtc/hctosys.c: unable to
> > open rtc device (rtc0)
> > [ 0.288526] BIOS EDD facility v0.16 2004-Jun-25, 0 devices found
> > [ 0.288531] EDD information not available.
> > [ 0.288996] Freeing unused kernel memory: 984k freed
> > [ 0.289247] Write protecting the kernel read-only data: 10240k
> > [ 0.293653] Freeing unused kernel memory: 20k freed
> > [ 0.294225] Freeing unused kernel memory: 1400k freed
> > Loading, please wait...
> > [ 0.339223] udevd[78]: starting version 173
> > Begin: Loading essential drivers ... done.
> > Begin: Running /scripts/init-premount ... done.
> > Begin: Mounting root file system ... Begin: Running /scripts/local-top ...
> > done.
> > Gave up waiting for root device. Common problems:
> >
- Boot args (cat /proc/cmdline)
> > - Check rootdelay= (did the system wait long enough?)
> > - Check root= (did the system wait for the right device?)
> > - Missing modules (cat /proc/modules; ls /dev)
> > ALERT! /dev/xvda2 does not exist. Dropping to a shell!
> > =================================================
> >
> > Following the suggestions in the shell:
> > - 'cat /proc/cmdline' = 'root=/dev/xvda2 ro' which is the correct root
> > partition (or should be at least)
> > - 'cat /proc/modules', no output
> > - ls /dev - no sign of xvda or any of its partitions
> >
> > Finally, here's the config file:
> >
> > =================================================
> > kernel = '/boot/vmlinuz-3.0.0-12-generic'
> > ramdisk = '/boot/initrd.img-3.0.0-12-generic'
> > vcpus =
'1'
> > memory = '256'
> > root = '/dev/xvda2 ro'
> > disk = [
> > 'phy:/dev/vgxen1/vm1-disk,xvda2,w',
> > 'phy:/dev/vgxen1/vm1-swap,xvda1,w',
> > ]
> > name = 'vm1'
> > vif = [ 'ip=[ ],mac=00:16:3E:12:C7:A0' ]
> >
> >
> >
> > =================================================
> >
> > Any advice would be much appreciated.
> >
> > - Can you try using the sda1/2 instead of xvda1/2 for the disk and swap
> > device?
> >
> >
> > _______________________________________________
> > Xen-users mailing list
> > Xen-users@xxxxxxxxxxxxxxxxxxx
> > http://lists.xensource.com/xen-users
> >
>
> Does the initrd have the xenblk drivers included? I know when i try to spin
> up Ubuntu 11.04 domU's on my debian dom0 i have to include the
> xenbus_probe_frontend module in the /etc/initramfs-tools/modules file so it
> gets included in the initrd on generation. I use pv-grub for my domU's so
> it all exists on the domU but its the same principle.
>
> -DDV
> Thanks to you both for the feedback. I tried changing xvda to sda but root still failed to mount.
>
> Regarding the xenblk drivers, it looks like they are loaded (correct me if I'm wrong). When I run on dom0 'cat /proc/modules | grep xen' I get the following:
>
> xen_netback 27854 0 [permanent], Live 0xffffffffa016a000
> xen_blkback 23177 0 [permanent], Live 0xffffffffa0163000
> xen_evtchn 13172 2 - Live 0xffffffffa00c6000
> xenfs 18311 1 - Live 0xffffffffa011c000
>
> I also
loaded xen-gntdev but still no luck. Next steps :)
