HELP! Fixing logical volume problem

yaximik · 06-06-2013, 11:34 AM

Hi,

It appears I accidentally renamed my main logical volume and now RHEL58 machine cannot boot normally. The original logvolume names were VolGroup00 and LogVol01, LogVol02, etc. The last command I used was

Code:

vgrename -t VolGroup00 SysVolume

which should not change records but should only make and keep the change during the current session (if this is correct understanding). Then I rebooted to erase any modifications. However, this is what I got upon reboot:

Code:

 Reading all physical volumes. This may take a while...
 Found volume group "SysVolume" using metadata type lvm2
 Volume group "VolGroup00" not found
Unable to access resume device (/dev/VolGroup00/LogVol01
mount: could not find filesystem '/dev/root'
setuproot: moving /dev failed: No such file or directory
setuproot: error mounting /proc: No such file or directory
setuproot: error mounting /sys: No such file or directory
setuproot: mount failed: No such file or directory
Kernel panic - not syncing: Attempted to kill init!
_

I guess I need to rename SysVolume back to LogVolume00, but I do not know how from the point the the system is stuck at, or how to proceed after logging in with a rescue disc or liveDVD. Please advise...

spazticclown · 06-06-2013, 03:54 PM

Booting to a live media and starting with a 'vgscan' to see what the volume is now called. If it just needs to be renamed "VolGroup00" that should be straight forward, you already know the command (minus the -t). You can also use your time in the live environment to back up any important data to an external device or network location just in case something goes wrong.

yaximik · 06-06-2013, 08:06 PM

Thanks! I was able to use the rescue mode from the installation disk, which put me into a shell, where all vg-related commands could be used with prefix lvm, like "lvm vgrename" instead of just "vgrename". I had first to deactivate the entire renamed logical volume "SysVolume" by using "lvm vgchange -an SysVolume", then "lvm vgrename SysVolume VolGroup00" and activate it back "lvm vgchange -ay VolGroup00" and reboot. Wheeew!