Re: [Xen-users] Troubles converting a pv host from dom0-hosted kernel to self-contained kernel

[Fabian Zimmermann <xen-users@xxxxxxxxxxxxxxxxx>]

Hi Guillaume Rousse,

> First issue: I found than it was mandatory to use root=/dev/xvda1 in 
> order to mount root device when booting, despite the partition being 
> exported as sda1 according to domU configuration. Is this normal ?
As far as I know, this depends on your DomU-Kernel. Did you try the 
xen.org-2.6.18.8?
> Second issue, the boot stop at root partition mount time, trying to 
> force fsck:
> [/sbin/fsck.ext3 (1) -- /] fsck.ext3 -a -a /dev/sda1
> fsck.ext3: No such file or directory while trying to open /dev/sda1
> /dev/sda1:
> The superblock could not be read or does not describe a correct ext2
> filesystem.  If the device is valid and it really contains an ext2
> filesystem (and not swap or ufs or something else), then the superblock
> is corrupt, and you might try running e2fsck with an alternate superblock:
>     e2fsck -b 8193 <device>
>
> This happens whatever device I use for root partition in domU /etc/fstab 
> (/dev/sda1 or /dev/xdva1). However, I can perfectly mount 
> /dev/vg0/sexonthebeach as an ext3 partition in domU. Morevoer, the 
> emergency shell has expected content monted under / in both case...
Try to boot your initramfs with init=/bin/bash and play around to find 
the right device-name (if any) f.e.:
mkdir /tmp/testme/
mount /dev/sda1 /tmp/testme/
mount /dev/xvda1 /tmp/testme/
..

> Last question, loosely related to this problem: is there a way to easily 
> convert a partition-based host to a disk-based host 
> (phy:/dev/vg0/foo,sda1 -> phy:/dev/vg0/foo,sda) ?
Maybe you find this useful: 
http://wiki.z-technologies.de/doku.php?id=partitiontabelle_nachtraeglich_erstellen
Bye,
Fabian


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