RE: [Xen-users] 3.4-testing : Kernel panic on bootup (mount: couldnotfind filesystem /dev/root/)

["Madhu Venugopal (vmadhu)" <vmadhu@xxxxxxxxx>]

Just before the error message, I see the following messages during the
bootup
Sequence :

<log>
scanning and configuring dmraid supported devices
creating root device
Mounting root filesystem
Mount: could not find filesystem '/dev/root'
<log>

Does that mean it is something to do with the dmraid modules ?

Thanks,
Madhu

> -----Original Message-----
> From: Fajar A. Nugraha [mailto:fajar@xxxxxxxxx]
> Sent: Thursday, August 27, 2009 5:52 AM
> To: Madhu Venugopal (vmadhu)
> Cc: Xen User-List
> Subject: Re: [Xen-users] 3.4-testing : Kernel panic on bootup (mount:
> couldnotfind filesystem /dev/root/)
> 
> On Thu, Aug 27, 2009 at 2:56 AM, Madhu Venugopal
> (vmadhu)<vmadhu@xxxxxxxxx> wrote:
> > Hi,
> >
> > I started everything from scratch...
> >
> > 1. Installed CentOS 5.3
> > 2. Installed XEN 3.4-testing as per README
> >
> > The same problem during the reboot. I copied the Grub entry from the
> > Native CentOS5.3 installation.
> 
> On your original setup, I noticed you're using "root=LABEL=/1" on the
> original grub stanza and "root=LABEL=/" on Xen stanza. Are they
> supposed to refer to the same root? This could be one of things
> causing you problems.
> 
> >
> > This time am seeing an error additional error :
> >
> > "Volume group : "VolGroup00" not Found"
> >
> > Searching the forums, I understand that this is a Logical Volume and
> > There are a few problems with Logical Volumes. But none of the
> > workarounds
> > Seems to work.
> >
> > I get a feeling that the "mkinitrd" is not doing its job completely.
> > (or) what am I missing ?
> 
> My guess is the kernel config you use is missing some essential
> modules needed to boot correctly. Here's some of the things you can
> try :
> 
> - Install RHEL's Xen. This should be pretty straightforward, you'd end
> up with Xen 3.1+ and a working grub.conf stanza for Xen with RHEL's
> kernel-xen
> - Install Xen package from gitco (http://www.gitco.de/repo/). You can
> get Xen 3.4.1 (currently in testing) but still using RHEL's kernel-xen
> - If that works, you can simply compile another xen kernel as you
> like, using either 2.6.18 or later pv_ops kernel. If using 2.6.18, you
> can use RHEL's kernel-xen config as a base.
> 
> --
> Fajar

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