Xen users - Mar 2010 - Re: Full Virtualised Guest not booting with waiting for sda2 to appear error

In that case, there are two things to verify or fix:
1) Make sure your config file for your domU is specifying the disk as hda
(disk=[''file:/path/to/file,hda,w'']).
2) Rebuild the initrd image for the domU with the proper drivers to bring
storage devices up correctly.  The best way to do this is probably to boot the
domU with the openSuSE iso image in rescue mode.  You can then mount the root
filesystem (and bind-mount proc, sys, and dev), chroot into the fs, and run
mkinitrd.

-Nick

Nick Couchman
Manager, Information Technology 
-----Original Message-----
From: <peter.chiu@stfc.ac.uk>
To: Nick Couchman <Nick.Couchman@seakr.com>
To:  <xen-users@lists.xensource.com>

Sent: 3/25/2010 2:29:18 AM
Subject: RE: [Xen-users] Full Virtualised Guest not booting with waiting for
sda2 to appear error

Thanks, Nick, for your response.

That is what I have done actually, as described in my
message:
> During the boot up sequence, I can enter into the boot OS selection
> menu, select the boot entry, and edit the root device from /dev/sda2
to
> /dev/hda2
But no good still, it then said waiting for /dev/hda2 and then timed
out, same symptom really.

Peter

-----Original Message-----
From: Nick Couchman [mailto:Nick.Couchman@seakr.com] 
Sent: 24 March 2010 22:19
To: xen-users@lists.xensource.com; Chiu, Peter (STFC,RAL,SSTD)
Subject: Re: [Xen-users] Full Virtualised Guest not booting with waiting
for sda2 to appear error

This means that either your kernel or your initrd does not include the
necessary drivers to support the root drive, or that you''re pointing it
at the wrong device.  The first thing to try is to escape the default
startup menu (hit Esc when the SuSE menu shows up) and edit the the
default boot entry (select the entry and press "e" to edit).  Select
the
line with the kernel image on it and press "e" to edit it - change
root=/dev/sda2 to root=/dev/hda2 and see if that works.

-Nick
>>> On 2010/03/24 at 13:14, <peter.chiu@stfc.ac.uk> wrote: 
> I would appreciate for some advice on how to resolve a DomU booting
> problem.
> 
> On an OpenSuse 11.2 (x86-64) server, I am trying to convert an
OpenSuse
> 10.0 (x86-64) system as a full virtualised guest, using an image file.
> 
> The image file is produced by running dd if=/dev/sda | ssh xen_server
> "dd of=/disks/guest_image".
> 
> This method has worked before on other OpenSuse 10.0 (x86_64) server,
> but not this time.
> 
> Basically when the guest os starts up, it seems to start up okay, but
> later complains
> 
>     "Waiting for /dev/sda2 to appear.... not found - exiting to
/bin/sh"
> 
> and subsequently times out and returns a $ prompt, which does not seem
> to recognise any commands.
> 
> I am aware that I need to
> 
> a.       modify the guest config file so that the disk statement is
> referring to hda,
> 
> b.       the image itself needs to be modified in its
> /boot/grub/menu.lst so that all references on sda2 are replaced by
hda2,
> and
> 
> c.       all references of sda2 in /etc/fstab are replaced by hda2.
> 
> This trick seems to work on another host (which incidentally uses sda1
/
> hda1, as oppose to sda2 / hda2).
> 
> But this time it does not.
> 
> Interesting enough, despite of the change of the /boot/grub/menu.lst
> file, it is still looking for /dev/sda2, rather than /dev/hda2.
> 
> During the boot up sequence, I can enter into the boot OS selection
> menu, select the boot entry, and edit the root device from /dev/sda2
to
> /dev/hda2.
> 
> Only this time, it fails with a similar error:
> 
>    "Waiting for /dev/hda2 to appear.... not found - exiting to
/bin/sh"
> 
> Any idea how to recover from this situation?
> 
> Many thanks.
> 
> Peter



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