[linux-lvm] quick pvresize question

Heinz J . Mauelshagen mauelshagen at sistina.com
Fri Apr 19 08:16:02 UTC 2002

On Wed, Apr 17, 2002 at 11:23:43PM +0000, James Hawtin wrote:
> On Thu, 18 Apr 2002, Trond Are Haugland wrote:
> > Hello people at Sistina!
> >
> > Is it possible/safe to resize a physical volume to use
> > free space _before_ the start block of the pv?
> >
> > Thank you so much for creating LVM for Linux,
> > it absolutely ROCKS :-)
> > --
> > Trond Are Haugland <trondare at trolltech.com>
> > Trolltech AS
> >
> No, its not, pv cannot be expanded or reduced in size, A dirty hack would
> be to create another PV on the disk, just make sure you speficy pvs when
> you do striping so you don't strip the same drive ;-)

You actually can pvresize.

If you have two partitions you can concatinate (fdisk) and
the first holds a PV, pvresize it to take the additional space.

Or you want to take advantage of the extended space in a RAID subsystems
volume (could be MD or a HW subsystem).

> Its fine for concatinated volumes. If you have a spare disk and a little
> time, create a new pv on your space disk use pvmove to mvoe from your old
> disk to the temp. vgreduce out the old disks pv, repartion the disk then
> create a new pv on it. vgexpand to the (old/new disk) then pvmove your
> data back then vgreduce out your temp disk.
> I have done this a few times :-) make sure you use latest version of lvm
> there are some problems with pvmove before that.
> James
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> read the LVM HOW-TO at http://www.sistina.com/lvm/Pages/howto.html


Heinz    -- The LVM Guy --

*** Software bugs are stupid.
    Nevertheless it needs not so stupid people to solve them ***


Heinz Mauelshagen                                 Sistina Software Inc.
Senior Consultant/Developer                       Am Sonnenhang 11
                                                  56242 Marienrachdorf
Mauelshagen at Sistina.com                           +49 2626 141200
                                                       FAX 924446

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