[Xen-users] domU corrupt after server crash, help needed trying to recover domU

[Rudi Ahlers <rudiahlers@xxxxxxxxx>]

Hi all, 

One of our Dell servers has failed badly, and one of the domU's has been corrupted in the process. It boots up to a point and then gives me a kernel panic:

Loading dm-zero.ko module
Loading dm-snapshot.ko module
Scanning and configuring dmraid supported devices
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.
Setting up new root fs
setuproot: moving /dev failed: No such file or directory
no fstab.sys, mounting internal defaults
setuproot: error mounting /proc: No such file or directory
setuproot: error mounting /sys: No such file or directory
Switching to new root and running init.
unmounting old /dev
unmounting old /proc
unmounting old /sys
switchroot: mount failed: No such file or directory
Kernel panic - not syncing: Attempted to kill init!


It shows up as a Zombie:

[root@xen ~]# xm list
Name                                      ID Mem(MiB) VCPUs State   Time(s)
Domain-0                                   0     1439     1 r-----    329.0
Zombie-hfserver2                          15     1024     1 ----c-      0.5
hfdns02                                   10      519     2 r-----   1552.8


I can't mount either:

root@xen ~]# mount /dev/data/hf
hfdns02    hfserver2
[root@xen ~]# mount /dev/data/hfserver2 /mnt/cpanel/
mount: you must specify the filesystem type
[root@xen ~]# mount -o loop /dev/data/hfserver2 /mnt/cpanel/
mount: you must specify the filesystem type

Here's the output of the LVM partitions:

[root@xen ~]# lvscan
  ACTIVE            '/dev/data/cpanel002' [100.00 GB] inherit
  ACTIVE            '/dev/data/windows2003_web' [30.00 GB] inherit
  ACTIVE            '/dev/data/storage' [50.00 GB] inherit
  ACTIVE   Original '/dev/data/hfserver2' [30.00 GB] inherit
  ACTIVE            '/dev/data/hfdns02' [30.00 GB] inherit
  ACTIVE            '/dev/data/pluto' [30.00 GB] inherit
  ACTIVE   Snapshot '/dev/data/pluto_s' [30.00 GB] inherit
  ACTIVE            '/dev/system/root' [39.06 GB] inherit
  ACTIVE            '/dev/system/swap' [9.75 GB] inherit
[root@xen ~]# vgscan
  Reading all physical volumes.  This may take a while...
  Found volume group "data" using metadata type lvm2
  Found volume group "system" using metadata type lvm2
[root@xen ~]#            


Does anyone know how to fix a LVM like this?                                                           

-- 
Kind Regards
Rudi Ahlers
CEO, SoftDux Hosting
Web: http://www.SoftDux.com
Office: 087 805 9573
Cell: 082 554 7532
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