[CentOS] Migration help please - moving OS to a different LVM partition

Robert Moskowitz rgm at htt-consult.com
Tue Jun 19 18:28:44 UTC 2007


I have set up a migration between two drives.  fIrst I got Centos 5 
working how I wanted on this drive, then set about copying it to another 
drive.

The Centos files on both drives are in sub-partitions in an LVM 
partition on their respective drives.

I first did a minimum install on the new drive and saved all those files 
to a separate directory.

The LVM partititons and sub-partitions all have unique names.

Well it has been a bit of a struggle to say it nicely.  Seems the LVM 
names are buried all over the place.


Of course I had to change /boot/grub/grub.conf, /boot/grub/menu.lst, and 
/etc/fstab

But more than that was the contents of /etc/lvm  So for those I just 
restored what was created in the minimum install.

Still I cannot get the new drive to boot.

If I boot with the latest kernel (which I copied to the new drive), I 
get a message finding the new LVM partition, could not find the old LVM 
partition then:

Mount: could no find filesystem /dev/root

and a kernel panic.

If I get the boot menu and select the kernel installed with the minimum 
install, it gets a little further.

It still tries to find the old LVM partition, cannot find 
/lib/modules.dep in the /lib/modules directory for this kernel (forget 
the whole filename), and then:

fsck.ext3 Unable to resolve 'label=/boot'

and then get dropped into a maintenance mode with the file system 
mounted in readonly mode.


So what Have I Missed?

Or is this a lost cause and I should just do a full install on the new 
drive and proceed from there????





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