[Ovirt-devel] Re: ovirt-appliance panic on boot

[Vigneswaran R]

Hello,

> On 11.11.2008, at 20:57, Alan Pevec wrote:
> 
>     Thomas von Steiger wrote:
> 
>         I get the same problem with version 0.95.
>         Thomas
>         On 11.11.2008, at 19:31, Dennis J. wrote:
> 
>             Hi,
> 
>             I just installed ovirt version 0.95 and when I start the appliance it panics with the following message:
> 
>             RAMDISK: Couldn't find valid RAM disk image starting at 0.
>             VFS: Cannot open root device "sda2" or unknown-block(0,0)
> 
>             Please append a correct "root=" boot option; here are the available partitions: Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0)
> 
>             Is this a known issue and how can I get the appliance to boot up properly? 
> 
>     is this i386 or x86_64 ?
> 
> 
> it's i386.
We were also facing the same problem. We solved the problem by 
recreating the initrd file.

Details,

1. mount the ovirt-appliance image

# nohup qemu-nbd /var/lib/libvirt/images/ovirt-appliance.img &
# modprobe nbd
# nbd-client localhost 1024 /dev/nbd0
# kpartx -a /dev/nbd0
# mount /dev/mapper/nbd0p2 /mnt
# mount /dev/mapper/nbd0p1 /mnt/boot

2. do a chroot, backup the initrd image and recreate it

# chroot /mnt
# mv /boot/initrd-2.6.26.6-79.fc9.i686 /root
# mkinitrd /boot/initrd-2.6.26.6-79.fc9.i686 2.6.26.6-79.fc9.i686
# exit

3. unmount

# umount /mnt
# kpartx -d /dev/nbd0
# nbd-client -d /dev/nbd0

4. boot the machine

# virsh start ovirt-appliance


It solved our problem.

ref: http://ovirt.org/page/TroubleShooting


Vignesh