mounting LVM disks via rescue disk (bad superblock)

dfezz1 · 12-05-2008, 10:22 AM

Hi,

I have a server that kernal panic-ed on reboot and has a bad super block.

I need to run fsck on the RootVG, but can't see or mount the filesystems, once I boot using the rescue disk.

I have a non-LVM /boot partition and I am using grub loader.
RHEL4.6
Dell R900
Perc-6i raid controller

So my real question is how to mount the root file system from the rescue disk, when using LVM

Thanks
-DFEZZ1

PTrenholme · 12-05-2008, 12:31 PM

Do a pvscan to see what you have on your attached drives, and then a vgchange -a y to activate the logical volumes.

You should then find the logical volumes in /dev/mapper/....

Note: NEVER RUN fcsk ON A PARTITION CONTAINING A VOLUME GROUP. Doing so will destroy the whole volume group. You can run fsck on /dev/mapper/VG/LV if necessary, but not on, for example, /dev/sda1.

dfezz1 · 12-06-2008, 08:29 PM

Thanks a lot for the info!!!!
I'll put it to good use this and next time

Thanks