Xen users - Jul 2006 - Problems booting Xen with LVM volumes

Hello,

I''m having problems booting a Xen kernel (dom0) on a quite standard
Celeron machine running Debian unstable and using LVM for managing
disk space.

My GRUB menu.lst has the followng entry for the Xen kernel

title          Xen 3.0 / XenLinux 2.6
kernel         /xen-3.0-i386.gz noreboot
module         /vmlinuz-2.6.16-2-xen-686 root=/dev/mapper/Debian-root ro
module         /initrd.img-2.6.16-2-xen-686

The boot process panics with the following messages

device-mapper: 4.5.0-ioctl (2005-10-04) initialised: dm-devel@redhat.com
mkdir: cannot create directory ''/devfs/Debian'': Read-only file
system
mount: unknown filesystem type ''devfs''
  Volume group "Debian" not found
umount: /dev: not mounted
umount: devfs: not mounted
mount: unknown filesystem type ''devfs''
umount:devfs: not mounted
pivot_root: No such file or directory
/sbin/init: 432: cannot open dev/console: No such file
Kernel panic - not syncing: Attempted to kill init!

For comparison, the machine boots up just fine with a standard kernel
(menu.lst entry as follows)

title           Debian GNU/Linux, kernel 2.6.17-1-486
root            (hd0,5)
kernel          /vmlinuz-2.6.17-1-486 root=/dev/mapper/Debian-root ro
initrd          /initrd.img-2.6.17-1-486
savedefault
boot

My filesystem looks like this

# mount
/dev/mapper/Debian-root on / type ext3 (rw,errors=remount-ro)
proc on /proc type proc (rw)
sysfs on /sys type sysfs (rw)
usbfs on /proc/bus/usb type usbfs (rw)
tmpfs on /dev/shm type tmpfs (rw)
devpts on /dev/pts type devpts (rw,gid=5,mode=620)
/dev/hda6 on /boot type ext3 (rw)
tmpfs on /dev type tmpfs (rw,size=10M,mode=0755)

All ideas on how to fix this are appreciated.

cheers,


-Matti


ps. Please cc me in your reply.

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On Fri, Jul 07, 2006 at 01:19:18AM +0300, Matti Pöllä
wrote:
> I''m having problems booting a Xen kernel (dom0) on a quite
standard
> Celeron machine running Debian unstable and using LVM for managing
> disk space.
Related to my earlier question here''s the output of "vgdisplay
<vggroupname>", "lvdisplay" and my /etc/fstab

# vgdisplay Debian
  --- Volume group ---
  VG Name               Debian
  System ID
  Format                lvm2
  Metadata Areas        1
  Metadata Sequence No  2
  VG Access             read/write
  VG Status             resizable
  MAX LV                0
  Cur LV                1
  Open LV               1
  Max PV                0
  Cur PV                1
  Act PV                1
  VG Size               17.32 GB
  PE Size               4.00 MB
  Total PE              4433
  Alloc PE / Size       4433 / 17.32 GB
  Free  PE / Size       0 / 0
  VG UUID               4HPsg6-lUdg-JFju-1rjz-fogP-0477-MGpxaZ

# lvdisplay
  --- Logical volume ---
  LV Name                /dev/Debian/root
  VG Name                Debian
  LV UUID                nGGOCG-DRHR-V0lq-4KL9-O2tX-hEzR-U8tBrP
  LV Write Access        read/write
  LV Status              available
  # open                 1
  LV Size                17.32 GB
  Current LE             4433
  Segments               1
  Allocation             inherit
  Read ahead sectors     0
  Block device           254:0

# cat /etc/fstab
# /etc/fstab: static file system information.
#
# <file system> <mount point>   <type>  <options>      
<dump>  <pass>
proc            /proc           proc    defaults        0       0
/dev/mapper/Debian-root /               ext3    defaults,errors=remount-ro 0    
1
/dev/hda6       /boot           ext3    defaults        0       2
/dev/hda5       none            swap    sw              0       0
/dev/hdc        /media/cdrom0   udf,iso9660 user,noauto     0       0


-Matti

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