Xen users - Apr 2005 - Xen dom0 doesn''t find root device - kernel panic

Thanks for supplying such a complete set of config details.
> # For booting GNU/Linux
> title  Gentoo Linux 2.6.11-gentoo-r4
> root (hd0,1)
> kernel (hd0,1)/kernel-2.6.11-gentoo-r4 init=/linuxrc
-----------------------------------------^

I guess this does some sort of Gentoo magic on boot.  Are you running with 
udev?  You should probably be using this under Xen too.  Try changing the 
last line of your xen boot section to:

module /vmlinuz-2.6.10-xen0 root=/dev/hda3 ro init=/linuxrc
> /dev/hda1 on /backup type xfs (rw,noatime) [backup]
> /dev/hda2 on /boot   type xfs (rw,noatime) [boot]
> /dev/hda3 on /       type xfs (rw,noatime) [root]
> /dev/hda4 on /home   type xfs (rw,noatime) [home]
Also, make sure you compile XFS support into the kernel (it''s not
enabled in
the default .config).

Cheers,
Mark

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Hi,

I''ve installed xen-2.0.5 from source on gentoo, but the xen dom0 kernel
doesn''t find the root device:

############################# snip ######################################

Kernel panic: VFS: Unable to mount root fs on unknown-block (3,3)

############################# snap ######################################


grub.conf:

############################# snip ######################################
#
# Sample boot menu configuration file
#

# Boot automatically after 30 secs.
timeout 10

# By default, boot the first entry.
default 0

# Fallback to the second entry.
#fallback 1

# Splash Image
splashimage=(hd0,1)/grub/splash.xpm.gz

# For booting GNU/Linux
title  Gentoo Linux 2.6.11-gentoo-r4
root (hd0,1)
kernel (hd0,1)/kernel-2.6.11-gentoo-r4 init=/linuxrc

# For booting XEN
title Xen 2.0 / XenLinux 2.6.10
root (hd0,1)
kernel /xen.gz
module /vmlinuz-2.6.10-xen0 root=/dev/hda3 ro console=tty0

# For booting Windows NT or Windows95
#title Windows NT / Windows 95 boot menu
#rootnoverify (hd0,0)
#makeactive
#chainloader  +1
# For loading DOS if Windows NT is installed
# chainload /bootsect.dos

# For installing GRUB into the hard disk
title Install GRUB into the hard disk
root    (hd0,1)
setup   (hd0)
############################# snap ######################################


mount -l:

############################# snip ######################################

/dev/hda1 on /backup type xfs (rw,noatime) [backup]
/dev/hda2 on /boot   type xfs (rw,noatime) [boot]
/dev/hda3 on /       type xfs (rw,noatime) [root]
/dev/hda4 on /home   type xfs (rw,noatime) [home]

none on /proc type proc (rw)
none on /sys type sysfs (rw)
none on /dev type ramfs (rw)
none on /dev/pts type devpts (rw)
none on /dev/shm type tmpfs (rw)
none on /proc/bus/usb type usbfs (rw)

############################# snap ######################################

How to I tell Xen the correct root device?

Thanx for any hint

Rene


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On So, 3.04.2005, 19:49, Mark Williamson sagte:
> Also, make sure you compile XFS support into the kernel (it''s not
enabled
> in
> the default .config).
>
That''s been it! I didn''t realize it as it was enabled in the
.config, but
not in the xen0_defconfig ;-)

Thanx

Rene

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