Date: Thu, 14 Oct 2004 10:10:03 +0300 From: mjraiha@fade.pp.fi To: freebsd-current@freebsd.org Subject: Re: Geom Vinum backwards compatible? Message-ID: <20041014071003.GA72451@daemon.adsl.kpnqwest.fi> In-Reply-To: <20041013160100.GA67958@daemon.adsl.kpnqwest.fi> References: <200410121602.i9CG2kOr082691@hugo10.ka.punkt.de> <20041013071207.GL98575@pcwin002.win.tue.nl> <20041013093207.GM98575@pcwin002.win.tue.nl> <20041013122714.M566@korben.prv.univie.ac.at> <20041013151041.GD60427@daemon.adsl.kpnqwest.fi> <20041013151820.GR98575@pcwin002.win.tue.nl> <20041013160100.GA67958@daemon.adsl.kpnqwest.fi>
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Hi,
On Wed, Oct 13, 2004 at 05:18:20PM +0200, Stijn Hoop wrote:
> On Wed, Oct 13, 2004 at 06:10:41PM +0300, Marko Raiha wrote:
> > On Wed, Oct 13, 2004 at 12:28:22PM +0200, Lukas Ertl wrote:
> > > On Wed, 13 Oct 2004, Stijn Hoop wrote:
> > > >I haven't tried this with geom_vinum, but using the old vinum I could
> > > >grow the BSD partition that contained my vinum "drive", then restart
> > > >vinum which would recognize more free space on it's "drive" and then add
> > > >another subdisk on that same drive. I've done this around a year ago, so
> > > >this might not work exactly as described but it is possible.
> > >
> > > That should work with geom_vinum as well, although I haven't tried yet.
> >
> > Is it possible to grow vinumized BSD partition only from the end or also
> > from the beginning?
>
> Seeing as vinum stores it's configuration data at the start of the
> vinum drive, I think it's not likely to work. You might get away with
> moving the data with dd, if you set your blocksize to sector size (or
> at least to a divisor of the spare space you allocate at the front). I
> wouldn't want to test this without good backups though, and at that
> point it might be easier to just recreate your vinum stuff from
> scratch and restoring anyway.
>
> > > >Even more likely to work is just adding another BSD partition on your
> > > >bigger drive, add that as a new vinum drive and then add
> > > >subdisks/plexes on top.
> > >
> > > That's the way to go, but just make sure you have only one vinum
> > > drive per disk.
> >
> > I have more than one vinum drive per disk and thats why I'm asking about
> > growing vinumized partition to get rid of other than one of them before
> > upgrading from 5.2.1 to 5.3.
>
> Why is more than 1 vinum drive per disk not good?
I don't know details but I remember to have read about troubles with
gvinum and many vinum drives per disk. Tried to find some threads of it
but found only this:
http://www.freebsd.org/cgi/getmsg.cgi?fetch=2027518+2030746+/usr/local/www/db/text/2004/freebsd-current/20040829.freebsd-current
Maybe Lukas Ertl knows more about this? Cause recommends to use only one
vinum drive per disk.
Regards,
--
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| Marko Räihä |
| Helsinki, GSM +358505515192 |
| Finland Email marko.raiha@helsinki.fi |
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