CentOS - Jan 2006 - How to upgrade hard drive in a single drive (with LVM2) computer

This one has me stumped and I'm sure I must be missing something 
trivial.  What is is eludes me.

I have a 20G drive that will be replaced with a 160G drive.  The /boot 
partition is just a standard type 83, and the swap is an 82.  The system 
root partition is in a LV, as is the /home partition.

I've upgraded hard drives dozens of times without incident, but never 
ona system with LVM.

I did this (booted into single-user mode):

1) Create the appropriate partitions on the new drive
2) Created an EXT3 partition and copies over /boot, ran GRUB to make it 
bootable.
3) did  the mkswap on the second partition.
4) did a pvcreate on the third partition on the new drive, then created 
th VG (vg1) and LV for the two paritions.
5) Mounted the new partitions under /mnt, then used tar to copy the 
files from the old to the new (excluding tmp mnt sys & proc)
6) Edited grub.conf (on the new drive) to point to VG1 instead of VG0 
for sysroot.  Edited /mnt/etc/fstab to point to the new locations (I 
changed the names of the logical volumes slightly.)
6) Disconnected the old drive, then booted.

The system booted, but got only as far as 'Red Hat nash' ...  then 
complained that it couldn't find vg0. (the volume group on the other 
disk).  I can't get into single-user mode when booting this single drive.

I'm trying to do this whole thing non-destructively so that the original 
drive is a backup, until we confirm that the new drive is behaving well.

Are these steps correct (and they should be without LVM) or is there 
something much easier and obvious that I'm missing?  I could, I suppose, 
add the new parition into the original volume group, and do the 'pvmove'
dance to get things over (as explained briefly in the LVM-HOWTO on Red 
Hat's site) but it wouldn't leave a bootable system on the original
drive.

Any suggestions would be greatly appreciated!

TIA,

Barry

"Barry L. Kline" <blkline at attglobal.net>
wrote:
> 6) Edited grub.conf (on the new drive) to point to VG1
> instead of VG0 for sysroot.
> Edited /mnt/etc/fstab to point to the new locations (I 
> changed the names of the logical volumes slightly.)
> 6) Disconnected the old drive, then booted.
When did you re-install GRUB (grub-insall)?
And when you did, did you have it use the _new_ grub.conf?
> The system booted, but got only as far as 'Red Hat nash'
> ...  then complained that it couldn't find vg0. (the volume
> group on the other disk).  I can't get into single-user
mode
> when booting this single drive.
> I'm trying to do this whole thing non-destructively so that
> the original drive is a backup, until we confirm that the
new
> drive is behaving well.
Consider booting the CentOS CD #1 in "rescue" mode.
Let it find your root and then chroot and run grub-install.
> Are these steps correct (and they should be without LVM) or
> is there something much easier and obvious that I'm
missing?
> I could, I suppose, add the new parition into the original
> volume group, and do the 'pvmove' dance to get things over
(as
> explained briefly in the LVM-HOWTO on Red Hat's site) but
it
> wouldn't leave a bootable system on the original drive.
It's best to treat the two sets of discs/volumes as
different, and never put them in the same system.  Again, use
CD #1 to boot into "rescue" mode, chroot and run grub-install
with only the new discs/volumes connected.

-- 
Bryan J. Smith     Professional, Technical Annoyance                     
b.j.smith at ieee.org      http://thebs413.blogspot.com
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