Re: [Xen-devel] xen and reiserfs

[Robin Green <greenrd@xxxxxxxxxxxxx>]

On Mon, 21 Feb 2005, Jim Martin wrote:
> Hi
> I'm running Xen on Fedora core 3...
> uname -a
> Linux groucho 2.6.10-1.1148_FC4xen0 #1 SMP Sat Feb 19 15:15:24 EST 2005 i686 
> i686 i386 GNU/Linux
> # xm list
> Name              Id  Mem(MB)  CPU  State  Time(s)  Console
> Domain-0           0      121    0  r----    140.9
>
> What I'm trying to do is get SuSE 9.2 to come up in it's own domain..
> /dev/hda2 = root for FC-3
> /dev/hdb2 = root for SuSE 9.2
>
> My config file in /etc/xen (suse)
> # cat suse
> kernel ="/boot/vmlinuz-2.6.10-1.1148_FC4xenU"
> memory = 64
> name = "suse"
> nics = 1
> disk = ['phy:hdb2,hdb2,w']
> root = "/dev/hdb2 ro"
>
> My problem...
> When I run 'xm create -c suse' everything seems fine right up to the point of
> mounting root and I get this error:
> md: ... autorun DONE.
> Kernel panic - not syncing: VFS: Unable to mount root fs on 
> unknown-block(3,66)
> <0>Rebooting in 1 seconds..
>
> This is a reiserfs /dev/hdb2 - does this xen kernel support reiserfs ?
> Or is my config file wrong ?
Xen kernels have no problem with reiserfs (indeed, they should work with 
any filesystem). Your problem is due to the fact that you are booting with
a Fedora kernel, which unlike (IIRC) the suse kernels, has reiserfs as a
module, not compiled in.

Not to worry, all you have to do is add an initrd line. Unfortunately,
the kernel-xenU package from Fedora does not currently ship with an 
initrd, so I think you'll have to build one yourself. Try this command
(I haven't tested it, but it should work):

 mkinitrd /boot/initrd-2.6.10-1.1148_FC4xenU.img 2.6.10-1.1148_FC4xenU

Then add

 ramdisk=/boot/initrd-2.6.10-1.1148_FC4xenU.img

to your config file in /etc/xen.

The kernel will load the necessary module(s) automatically so it should
not be necessary to modify the initrd produced by mkinitrd.

Hope this helps,
--
Robin


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