[linux-lvm] shuffling drives along the chain?

Steve Wray stevew at catalyst.net.nz
Thu Jun 26 16:04:02 UTC 2003

I was a bit worried as one time I reassembled
a machine with two drives swapped around accidentally;
hdc and hde were swapped and had PV's in the same VG.
LVM got terribly confused even though vgscan is run
at boot time. Fortunately I had just taken a backup
before starting otherwise I'd have lost lots of data!

Joe Thornber <thornber at sistina.com> writes:

> On Wed, Jun 25, 2003 at 02:14:59PM +1200, Steve Wray wrote:
> > 
> > I have an existing LVM setup over 3 hard drives,
> > hda, hdc, hde, with PV's and VG's set up just so.
> > 
> > I wish to add a new drive as the new hda, shifting
> > the other drives down the chain such that the old hda
> > becomes the new hdb and so forth.
> > 
> > The new drive will have new VG's on its PV's with
> > no overlap; no PV on the new drive will be part
> > of any VG on the old drives.
> > 
> > Is it just a simple matter of doing the 
> > vgchange -an <volume group>, vgexport <volume group>, 
> > shutdown & move the drives, reboot, 
> > install Linux onto the new drive and then
> > pvscan, vgimport <volume group> <physical volumes>
> > dance?
> > 
> > Or are there any gotchas to be aware of?
> You don't need to export/import if you are just moving devices around.
> Just vgscan after moving them.
> - Joe

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