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

[Sadique Puthen <sputhenp@xxxxxxxxxx>]

Mihai Tanasescu wrote:
> 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
> >
> > _______________________________________________
> > Xen-users mailing list
> > Xen-users@xxxxxxxxxxxxxxxxxxx
> > http://lists.xensource.com/xen-users
> 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',
>              ]
Why don't use tap:aio and xvda1. Obviously should have the below modules 
mapped by the guests' modprobe.conf.
alias eth0 xennet
alias scsi_hostadapter xenblk

--Sadique

> #  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 ?
>
>
> _______________________________________________
> Xen-users mailing list
> Xen-users@xxxxxxxxxxxxxxxxxxx
> http://lists.xensource.com/xen-users
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