CentOS - May 2008 - Is it possible to lvrename the current root partition?

I'd like to rename my existing volume groups and logical volumes (I  
picked names a long time ago I no longer like :-).  I recently  
stumbled across the lvrename and vgrename commands, but when I tried  
the former to rename the logical volume that my root partition  
resides on, the system became unbootable.

In addition to renaming the LV (and VG if I decide to to that as  
well), what else needs to be changed?  So far my list includes:

   o /etc/fstabb
   o /boot/grub/grub.conf
   o /dev/<vgname>/<lvnamex>
   o /dev/mapper/<vgname-lvnamex>

I was hoping the lvrename and/or vgrename would take care of these  
details.  Are there any scripts out there that take care of all the  
details?  If not, I may write one (once I have the recipe to get this  
working, of course).

Alfred

I have never done this before, but I would think that the only thing  
that you would have to change would be fstab and your grub  
configuration. vgrename and lvrename did not recreate items under /dev?

Did you get the system booting or is this more of just a list for a  
script that you are planning to create?

Josh Gimer

On May 2, 2008, at 3:04 PM, Alfred von Campe wrote:
> I'd like to rename my existing volume groups and logical volumes (I  
> picked names a long time ago I no longer like :-).  I recently  
> stumbled across the lvrename and vgrename commands, but when I tried  
> the former to rename the logical volume that my root partition  
> resides on, the system became unbootable.
>
> In addition to renaming the LV (and VG if I decide to to that as  
> well), what else needs to be changed?  So far my list includes:
>
>  o /etc/fstabb
>  o /boot/grub/grub.conf
>  o /dev/<vgname>/<lvnamex>
>  o /dev/mapper/<vgname-lvnamex>
>
> I was hoping the lvrename and/or vgrename would take care of these  
> details.  Are there any scripts out there that take care of all the  
> details?  If not, I may write one (once I have the recipe to get  
> this working, of course).
>
> Alfred
>
> _______________________________________________
> CentOS mailing list
> CentOS at centos.org
> http://lists.centos.org/mailman/listinfo/centos

On Fri, 2008-05-02 at 17:04 -0400, Alfred von Campe
wrote:
> I'd like to rename my existing volume groups and logical volumes (I  
> picked names a long time ago I no longer like :-).  I recently  
> stumbled across the lvrename and vgrename commands, but when I tried  
> the former to rename the logical volume that my root partition  
> resides on, the system became unbootable.
> 
> In addition to renaming the LV (and VG if I decide to to that as  
> well), what else needs to be changed?  So far my list includes:
> 
>    o /etc/fstabb
>    o /boot/grub/grub.conf
>    o /dev/<vgname>/<lvnamex>
>    o /dev/mapper/<vgname-lvnamex>
> 
> I was hoping the lvrename and/or vgrename would take care of these  
> details.  Are there any scripts out there that take care of all the  
> details?  If not, I may write one (once I have the recipe to get this  
> working, of course).
Remake your initrd. In there is a reference to the volgroup/lvol that
you will want to change. Or you can add and change the parameter to
ignore check failures.

Then just the usual fstab, local scripts, etc.
> 
> Alfred
> <snip sig stuff>
HTH
-- 
Bill

Alfred von Campe wrote:
> 
> I'd like to rename my existing volume groups and logical volumes (I  
> picked names a long time ago I no longer like :-).  I recently  
> stumbled across the lvrename and vgrename commands, but when I tried  
> the former to rename the logical volume that my root partition  
> resides on, the system became unbootable.
> 
> In addition to renaming the LV (and VG if I decide to to that as  
> well), what else needs to be changed?  So far my list includes:
> 
>    o /etc/fstabb
>    o /boot/grub/grub.conf
>    o /dev/<vgname>/<lvnamex>
>    o /dev/mapper/<vgname-lvnamex>
> 
> I was hoping the lvrename and/or vgrename would take care of these  
> details.  Are there any scripts out there that take care of all the  
> details?  If not, I may write one (once I have the recipe to get this  
> working, of course).
Sure you can do all this from rescue mode off the first CD.

Boot the cd type in 'linux rescue' and continue to the command prompt.

At the command prompt:

1) make sure swap isn't using the swap lv
	- swapoff -a

2) unmount all lvs mounted
	- umount /mnt/sysimage/boot
	- umount /mnt/sysimage

3) mark all lvs as unavailable
	- lvchange -a n <vgname>

4) rename the volume group
	- vgrename <oldvgname> <newvgname>

5) rename the logical volumes
	- lvrename <vgname>\<oldlvname> <newlvname>

6) repeat #5 as necessary

7) re-activate all the lvs
	- lvchange -a y <vgname>

8) re-mount the root and boot lvs,
	- mount /dev/<vgname>/<rootlv> /mnt/sysimage
	- mount /dev/<vgname>/<bootlv> /mnt/sysimage/boot

9) chroot to the mounts with, 'chroot /mnt/sysimage /bin/bash'

10) edit /etc/fstab

11) edit /boot/grub/grub.conf

That should do it.

-Ross

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