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

[Mihai Tanasescu <mihai@xxxxxxxx>]

Sadique Puthen wrote:
> 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
I used these before (afterwards I tried with the file handle).


Still the system fails before loading the virtual machine.
> > #  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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> http://lists.xensource.com/xen-users

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