[linux-lvm] vgmerge with different physical extent sizes

[linux-lvm] vgmerge with different physical extent sizes

[Ross Boylan]

What happens if you vgmerge 2 VG's and they have different physical
extent sizes?

I ask because I created a VG and specfied
vgcreate -s 32MB rose /dev/sdc2
# created a LV and formatted it, then inactivated it
vgmerge daisy rose

I notice that vgdisplay now says that daisy has
  PE Size               32.00 MB.

When I created daisy I don't think I used the -s option, though I may
have created it with a Debian tool that picked 32MB.  I've looked for an
explicit record, or the results of an earlier vgdisplay, but I don't see
anything (I do have some earlier lvdisplay's).

Is PE size mismatch anything that might be causing me trouble?  This is
LVM2.

Thanks.
Ross

Re: [linux-lvm] vgmerge with different physical extent sizes

[Stuart D. Gathman]

On Thu, 23 Dec 2010, Ross Boylan wrote:

> What happens if you vgmerge 2 VG's and they have different physical
> extent sizes?

The man page says it should fail.  It's possible that if everything
lines up, it automatically changes the extent size of either the
source or destination VG.

It is possible to change the PE size with vgchange (some lvresizing/pvmoving
may be required and must be done manually).

-- 
	      Stuart D. Gathman <stuart@bmsi.com>
    Business Management Systems Inc.  Phone: 703 591-0911 Fax: 703 591-6154
"Confutatis maledictis, flammis acribus addictis" - background song for
a Microsoft sponsored "Where do you want to go from here?" commercial.