On Fri, May 8, 2009 at 2:30 PM, Rudi Ahlers <rudiahlers@xxxxxxxxx> wrote:
[root@xen ~]# losetup /dev/loop4 /dev/data/hfserver2
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?
--
Here's what I've done so far:
[root@xen ~]# losetup /dev/loop4 /dev/data/hfserver2
# This mounts the LVM partition as imaginary physical to /dev/loop4
# data is the virtual group (VG) name
# This creates a device map with partitions in /dev/data/hfserver in /dev/mapper
[root@xen ~]# kpartx -va /dev/loop4
add map loop4p1 : 0 208782 linear /dev/loop4 63
add map loop4p2 : 0 62701695 linear /dev/loop4 208845
[root@xen ~]# vgscan
Reading all physical volumes. This may take a while...
Found volume group "VolGroup00" using metadata type lvm2
Found volume group "data" using metadata type lvm2
Found volume group "system" using metadata type lvm2
[root@xen ~]# lvscan
inactive '/dev/VolGroup00/LogVol00' [27.94 GB] inherit
inactive '/dev/VolGroup00/LogVol01' [1.94 GB] inherit
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 ~]# lvchange -ay VolGroup00
[root@xen ~]# lvscan
ACTIVE '/dev/VolGroup00/LogVol00' [27.94 GB] inherit
ACTIVE '/dev/VolGroup00/LogVol01' [1.94 GB] inherit
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 ~]# e2fsck /dev/VolGroup00/LogVol00
e2fsck 1.39 (29-May-2006)
/dev/VolGroup00/LogVol00: clean, 631982/7325696 files, 4512772/7323648 blocks
At first it found a whole lot of damages inodes which I repaired.
Then, I reversed the process:
[root@xen ~]# lvchange -an VolGroup00
[root@xen ~]# lvscan
inactive '/dev/VolGroup00/LogVol00' [27.94 GB] inherit
inactive '/dev/VolGroup00/LogVol01' [1.94 GB] inherit
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 ~]# vgchange -an VolGroup00
0 logical volume(s) in volume group "VolGroup00" now active
[root@xen ~]# kpartx -d /dev/loop4
[root@xen ~]# losetup -d /dev/loop4
[root@xen ~]#
[root@xen ~]# xm create -c /etc/xen/hfserver2
And then it dies:
Reading all physical volumes. This may take a while...
Found volume group "VolGroup00" using metadata type lvm2
Activating logical volumes
2 logical volume(s) in volume group "VolGroup00" now active
Creating root device.
Mounting root filesystem.
kjournald starting. Commit interval 5 seconds
EXT3-fs: mounted filesystem with ordered data mode.
Setting up other filesystems.
Setting up new root fs
no fstab.sys, mounting internal defaults
Switching to new root and running init.
unmounting old /dev
unmounting old /proc
unmounting old /sys
exec of init (/sbin/init) failed!!!: No such file or directory
Kernel panic - not syncing: Attempted to kill init!
[root@xen ~]#
--
Kind Regards
Rudi Ahlers
CEO, SoftDux Hosting
Web: http://www.SoftDux.com
Office: 087 805 9573
Cell: 082 554 7532
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