Kernel panic when LVM VG is changed

[nilesh vaghela]

On 2/7/07, tlann at technoeclectic.com <tlann at technoeclectic.com> wrote:
>
> I'm running into a kernel panic when I change the VolGroup that the system
> is in.  I'll go more into how I do this in a minute.  But the reason I do
> it is that I must take a hard drive out of another system put it in
> another system so the data can be copied.
>
> I have 9 systems that have the default lvm install config. The 9th system
> is used to put the harddrives from the 8 systems one at a time to read the
> data from the drives.  I'm trying to change the VG VolGroup00 of system 9
> to VolGroup99 so that I can mount the other system with VolGroup00 when I
> need too.  Hopefully, with a usb adaptor or something of that sort.
>
> What I do is boot system 9 with the Rescue CD and do a
> # lvm vgchange -a n
> and then
> # lvm vgrename VolGroup00 VolGroup99
> and I get a success message that the VG has been changed.  I test mount
> the lv and I can read and write data fine.
>
> I then reboot the system edit the line in grub on bootup to VolGroup99 and
> get the kernel panic message below the line.
>
> I'm using RedHat Enterprise Linux WS 4 Update 4 with kernel 2.6.9-46.ELsmp
> which I found from the message forums.
>
> Is their some sort of config I'm not changing that I'm supposed too?  I
> thought the kernel update I applied was supposed to fix this.
>
> Thanks,
> Thomas
>
> ----------------------
> root(hd0,0)
> Filesystem type is extfs, partition type 0x83
>
> Kernel /vmlinuz-2.6.9-46.ELsmp ro root=/dev/VolGroup99/LogVol00 rhgb quiet
>   [Linux-bzImage, setup=0x1400, size=0x1604fe]
> initrd /initrd-2.6.9-49.ELsmp.img
>   [Linux-initrd at 0x37ef3000,0xfcaf9 bytes/
> Uncompressing Linux... Ok, booting the Kernel
> Red Hat nash version 4.2.1.8 starting
>   Reading all physical volumes.  This may take awhile...
>   Found volume group "VolGroup99" using metadata type lvm2
>   Volume group "Vol"Group00" not found


It is clearly indicate that VolGroup00 not found so some entry should be
change in /boot/grub/grub.conf

you can not load the root file system.


Please paste your grub.conf file

If you need further assistance.


Error: /bin/lvm exited abnormally! (pid 484)
> mount: error 6 mounting ext3
> mount: error 2 mounting none
> switchroot: mount failed: 22
> umount /initrd/dev failed: 2
> Kernel panic - not synching: Attempted to kill init!
>
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-- 
Nilesh Vaghela
ElectroMech
Redhat Channel Partner and Training Partner
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