Re: [Xen-users] Xen HDD failure - Migration

[Mihai Tanasescu <mihai@xxxxxxxx>]

Alexander Hoßdorf wrote:
> Mihai Tanasescu schrieb:
> > Hello all,
> >
> >
> >
> > I just started experimenting with XEN and ran into problems 1 month 
> > afterwards.
> > I had it on a single hard-disk system and the disk started failing.
> > I managed to copy /etc/xen and /home/xen (with the image files for 
> > each virtual machine I had) to some remote storage.
> >
> > Now I reinstalled the machine on a RAID 1 enabled system and copied 
> > the files back.
> > Configuration looks the following in /etc/fstab:
> >
> > [root@robu076pps mnt]# cat /etc/fstab
> > /dev/VolGroup00/LogVol00 /                       ext3    
> > defaults        1 1
> > LABEL=/boot             /boot                   ext3    
> > defaults        1 2
> > tmpfs                   /dev/shm                tmpfs   
> > defaults        0 0
> > devpts                  /dev/pts                devpts  
> > gid=5,mode=620  0 0
> > sysfs                   /sys                    sysfs   
> > defaults        0 0
> > proc                    /proc                   proc    
> > defaults        0 0
> > /dev/VolGroup00/LogVol01 swap                    swap    
> > defaults        0 0
> >
> > but if I try to start one of the old virtual machines (after 
> > modifying initrd and kernel parameters to the actual xen ones in this 
> > system) I get:
> > Scanning and configuring dmraid supported devices
> > no block devices found
> > failed to stat() /dev/mapper/nvidia_adcabaef
> > Scanning logical volumes
> >   Reading all physical volumes.  This may take a while...
> >   No volume groups found
> > Activating logical volumes
> >   Volume group "VolGroup00" not found
> > Creating root device.
> > Mounting root filesystem.
> > mount: could not find filesystem '/dev/root'
> > Setting up other filesystems.
> >
> > Afterwards the Virtual Machine stops.
> >
> >
> > Can someone help me on how to troubleshoot this ?
> > I'm trying to avoid reinstalling the affected systems completely.
> >
> >
> >
> > Thanks,
> > Mihai
> Hi,
>
> could you show us your VM configuration file please?
>
> Cheers,
> Alex
>
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For example one of the VM:

#  Kernel + memory size
#
kernel      = '/boot/vmlinuz-2.6.18-92.el5xen'
ramdisk     = '/boot/initrd-2.6.18-92.el5xen.img'
memory      = '512'

#
#  Disk device(s).
#
root        = '/dev/hda2 ro'
disk        = [
                 
'file:/home/xen/domains/robu094vps.airbites.ro/swap.img,hda1,w',
                 
'file:/home/xen/domains/robu094vps.airbites.ro/disk.img,hda2,w',
             ]

#  Hostname
#
name        = 'robu094'

#
#  Networking
#
vif         = [ 'ip=192.168.20.45,mac=00:16:3E:FC:C7:A8' ]

#
#  Behaviour
#
on_poweroff = 'destroy'
on_reboot   = 'restart'
on_crash    = 'restart'

extra = '2 console=xvc0'



The image file exists in that directory ( I checked ).

On the old machine the setup had a software raid (md0 device) and this 
VM Xen running on it.
On the new machine I have one of those nvidia fake RAID and Centos 
automatically made volume groups using LVM.
Those are the only differences.


Any idea ?


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