WARNING - OLD ARCHIVES

This is an archived copy of the Xen.org mailing list, which we have preserved to ensure that existing links to archives are not broken. The live archive, which contains the latest emails, can be found at http://lists.xen.org/
   
 
 
Xen 
 
Home Products Support Community News
 
   
 

xen-users

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

To: Mihai Tanasescu <mihai@xxxxxxxx>
Subject: Re: [Xen-users] Xen HDD failure - Migration
From: Sadique Puthen <sputhenp@xxxxxxxxxx>
Date: Thu, 14 Aug 2008 13:31:24 +0530
Cc: xen-users@xxxxxxxxxxxxxxxxxxx
Delivery-date: Thu, 14 Aug 2008 01:02:10 -0700
Envelope-to: www-data@xxxxxxxxxxxxxxxxxxx
In-reply-to: <48A27DE3.4040709@xxxxxxxx>
List-help: <mailto:xen-users-request@lists.xensource.com?subject=help>
List-id: Xen user discussion <xen-users.lists.xensource.com>
List-post: <mailto:xen-users@lists.xensource.com>
List-subscribe: <http://lists.xensource.com/mailman/listinfo/xen-users>, <mailto:xen-users-request@lists.xensource.com?subject=subscribe>
List-unsubscribe: <http://lists.xensource.com/mailman/listinfo/xen-users>, <mailto:xen-users-request@lists.xensource.com?subject=unsubscribe>
References: <48A21E52.3020204@xxxxxxxx> <48A27370.70109@xxxxxxxxxxx> <48A27DE3.4040709@xxxxxxxx>
Sender: xen-users-bounces@xxxxxxxxxxxxxxxxxxx
User-agent: Thunderbird 2.0.0.14 (X11/20080501)
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



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

<Prev in Thread] Current Thread [Next in Thread>