Re: [Xen-users] CentOS 5.1 and Xen - mount: could not find filesystem '/dev/root'

[Sadique Puthen <sputhenp@xxxxxxxxxx>]

Erich Weiler wrote:
> Hi all-
>
> I'm hoping someone can help me with this problem with Xen under CentOS 
> 5.1 (RHEL 5.1) I'm having... This is the Xen package that comes stock 
> with the distribution, I didn't compile it from source.  I can boot 
> Domain0 and the hypervisor just fine.  I'm trying to bring up a Xen 
> guest VM and it crashes on boot, with this error:
> # xm create -c tcga1 vmid=1
>
> ...
> Creating root device.
> Mounting root filesystem.
> mount: could not find filesystem '/dev/root'
> Setting up other filesystems.
> Setting up new root fs
> setuproot: moving /dev failed: No such file or directory
> no fstab.sys, mounting internal defaults
> setuproot: error mounting /proc: No such file or directory
> setuproot: error mounting /sys: No such file or directory
> Switching to new root and running init.
> unmounting old /dev
> unmounting old /proc
> unmounting old /sys
> switchroot: mount failed: No such file or directory
> Kernel panic - not syncing: Attempted to kill init!
>
> I can't for the life of me figure this out... Here is my domain config 
> file info:
> kernel = "/boot/vmlinuz-2.6.18-53.1.4.el5xen"
> ramdisk = "/boot/initrd-2.6.18-53.1.4.el5xen.img"
> memory = 4096
> name = "tcga1"
> cpus = "" # leave to Xen to pick
> vcpus = 2
> vif = [ '' ]
> disk = [ 'phy:tcga1vg/tcga1root,sda1,w' ]
> disk = [ 'phy:tcga1vg/tcga1data,sda2,w' ]
> disk = [ 'phy:tcga1vg/tcga1swap,sda3,w' ]
> root = "/dev/sda1 ro"
> extra = "selinux=0 3"
>
> I tried making a custom initrd file with --preload=xennet 
> --preload=xenblk and that didn't seem to help...
Did you change sdax in disk = section to xvdax? Did you change root = to 
from /dev/sda1 ro to /dev/xvda1?
Did you change the /etc/fstab of the guest accordingly?

>   Also I'm using LVM for my disk devices but I don't think that should 
> make a difference?
> I have the guest domain VM configured in fstab to reference sda1, sda2 
> and sda3 as noted in the above config... Does anyone have guidance for 
> me?
> Also, one other question... Given my above config, is this VM running 
> in para-virtualized mode or full-virtualized mode? I think it's para 
> but hard to know for sure...
It's para.

--Sadique

> Thanks much in advance!
>
> -some_guy
>
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