Re: [Xen-users] GRUB stopped working in xen (hvm, qemu-dm)

[Todd Deshane <todd.deshane@xxxxxxx>]

On Wed, Jun 15, 2011 at 5:14 AM, Karsten von Hornbostel
<perlmeister@xxxxxxxx> wrote:
> Hi,
>
> first of all, my name is Karsten and I am fairly new to xen. A former 
> colleague
> of mine has set up a xen dom0 with 4 virtual machines runnig on it. A few 
> months
> ago this colleague left the company. Last week our office Building has been 
> hit
> by a lightning wich resulted in an power blackout.
>
bad luck for sure.

> After the power went back again, the system booted and all but one of the
> virtual machines went back. The virtual machine that did not went back seems 
> not
> to be able to boot, i see some kind of grub error. The console of this machine
> prints out:
>
> =====
> Plex86/Bochs VGABios current-cvs 07 Jun 2008
> This VGA/VBE Bios is released under the GNU LGPL
> Please visit :
>  * http://bochs.soureeferge.net
>  * http://www.nongnu.org/vgabios
> cirrus-compatible VGA is detected
> HVMAssist BIOS, 1 Cpu, $Revision: 1.138 $ $Date: 2005/05/07 15:55:26 $
> ata0 master: QEMU HARDDISK ATA-7 Hard-Disk (35840 MBgtes)
> ata0 slave: Unknown device
> ata1 master: masteri QEMU CD-ROM ATAPI-4 CD-Rom/DVD-Rom
> ata1 slave: Unknown device
> Booting from Hard Disk...
> GRUB GRUB _
> =====
>
> After this, the boot process hangs and the vm seems to be verry busy, CPU goes
> up to 100%.
>
> The host system seems to be OpenSuSE 11.0, while the virtual machine is 
> running
> debian 4.0.
>
> The configuration of this virtual machine:
>
> ====
> erde:/ # cat /etc/xen/vm/VM4
> name="VM4"
> uuid="67896e91-b77f-edcc-48c8-ef3016821ecd"
> memory=512
> vcpus=2
> on_poweroff="destroy"
> on_reboot="restart"
> on_crash="destroy"
> localtime=0
> builder="hvm"
> extid=0
> device_model="/usr/lib/xen/bin/qemu-dm"
> kernel="/usr/lib/xen/boot/hvmloader"
> boot="c"
> disk=[ 'file:/var/lib/xen/images/VM4/disk0,hda,w', 
> 'phy:/dev/cdrom,hdc:cdrom,r',
> ]
> vif=[ 'mac=00:16:3e:62:62:80,model=rtl8139,type=ioemu', ]
> stdvga=0
> vnc=1
> vncunused=1
> apic=0
> acpi=1
> pae=1
> serial="pty"
> ====
>
> I tried to attach the DomU disk image of this machine to Dom0 using xm
> bock-attach and it worked. All files are there, e2fsck did not find any 
> errors.
>
> So my question is, how can i recover this virtual machine? I there a chance to
> re-install grub? What is the meaning of this "GRUB GRUB" printed out by grub?
>

Looks like the master boot record got messed up and/or grub is broken.
You can boot your domU guest from a live CD by changing the boot
parameter to:

boot="dc"
and adding a ISO file for a cdrom drive

see an example here:
http://www.novell.com/communities/node/3046/how-boot-paravirtual-xen-domu-cd-rom-or-iso-sles-10-sp1-or-opensuse-103

Thanks,
Todd

> Thanks in advance,
> Karsten
>
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>



-- 
Todd Deshane
http://www.linkedin.com/in/deshantm
http://www.xen.org/products/cloudxen.html
http://runningxen.com/

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