Re: [linux-lvm] Problem extending a LV

From: josv@osp.nl
To: linux-lvm@sistina.com
Cc: AJ Lewis <lewis@sistina.com>
Subject: Re: [linux-lvm] Problem extending a LV
Date: Tue, 29 May 2001 23:55:23 +0200	[thread overview]
Message-ID: <20010529235523.B1414@gatekeeper.osp.nl> (raw)
In-Reply-To: <Pine.LNX.4.33.0105291333520.8330-100000@UberGeek.coremetrics.com>; from austin@coremetrics.com on Tue, May 29, 2001 at 01:35:07PM -0500

Hi,

You mention that Veritas (presumably the Volume Manager) has this
functionality. Are you sure that you can add a subdisk to a striped plex
in a volume? I'm just curious because I can not remember that this is
actually possible....

++Jos

And thus it came to pass that Austin Gonyou wrote:
(on Tue, May 29, 2001 at 01:35:07PM -0500 to be exact)

> Are there plans to have this functionality? As in, I have a 2 disk striped
> set, and now I'm running out of space, so I add a third pv, and now I want
> to restripe and extend onto the third disk? I ask because Veritas has this
> ability, and it could be a deal breaker for some choosing which to use.
> 
> -- 
> Austin Gonyou
> Systems Architect, CCNA
> Coremetrics, Inc.
> Phone: 512-796-9023
> email: austin@coremetrics.com
> 
> On Tue, 29 May 2001, AJ Lewis wrote:
> 
> > On Tue, May 29, 2001 at 11:33:54AM +0200, Carsten Balzer wrote:
> > > If I try to extend the LV with:
> > > lvextend -L+78164M /dev/NVolGroup/nVol
> > > then I get:
> > > lvextend -- rounding size 240119808 KB to stripe boundary size
> > 240123904
> > > KB
> > > lvextend -- only 19541 free physical extents in volume group
> > "NVolGroup"
> > >
> > > Next try with: lvextend -l+19541 /dev/NVolGroup/nVol
> > > lvextend -- rounding size 240119808 KB to stripe boundary size
> > 240123904
> > > KB
> > > lvextend -- only 19541 free physical extents in volume group
> > "NVolGroup"
> >
> > You cannot currently extend a striped LV onto a new disk.  It would
> > involve
> > completely rearranging the data to account for the new striping
> > configuration.  The reason you get the error is because the tools know
> > this
> > and are trying to extend on the two original PVs.  If you want to have
> > the
> > ability to extend the LV onto new disks, you must use linear LVs.
> >
> > Regards,
> >
> 
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-- 
If you do what you've always done,
You get what you've always gotten.