Date: Sat, 26 Jun 2004 18:08:21 +0200 From: Pawel Jakub Dawidek <pjd@FreeBSD.org> To: Lukas Ertl <le@FreeBSD.org> Cc: current@FreeBSD.org Subject: Re: geom_vinum problems (crashes and lockups) Message-ID: <20040626160821.GG12007@darkness.comp.waw.pl> In-Reply-To: <20040626174133.I666@korben.in.tern> References: <20040625013138.54319.qmail@web53710.mail.yahoo.com> <20040626135735.E666@korben.in.tern> <20040626123530.GF12007@darkness.comp.waw.pl> <20040626174133.I666@korben.in.tern>
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--ZGfVcqCQYT4RlWas Content-Type: text/plain; charset=iso-8859-2 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Sat, Jun 26, 2004 at 05:45:51PM +0200, Lukas Ertl wrote: +> On Sat, 26 Jun 2004, Pawel Jakub Dawidek wrote: +>=20 +> >On Sat, Jun 26, 2004 at 02:07:03PM +0200, Lukas Ertl wrote: +> >+> This is a situation that I currently consider 'unsupported'. The=20 +> >problem +> >+> is that the 'd' partition has no offset, thus it is (from the point = of +> >+> view of a geom_vinum drive geom) the same as the 'c' partition. Thi= s is +> >+> the first problem. The second problem is the on-disk format of a +> >+> bsdlabel. As far as I understand it, this meta-data is stored inside +> >+> the first partition, so when you open the drive for writing (i.e. +> >+> mount, fsck) you trigger a spoil event which cause all kinds of=20 +> >confusion +> >+> for geom_vinum. +> > +> >I don't know exactly what problems you got, but maybe it can help you: +> >To avoid spoiling and metadata changes under me, I'm opening every +> >provider, which I want to use in geom_mirror (r1w1e1), even if provider +> >which I create isn't yet opened. +>=20 +> This was a good tip, but unfortunately it still doesn't work out. I=20 +> always run into the 'spoiled but dcr =3D %d' KASSERT. Unfortunately, ke= rnel=20 +> debugging is currently rather a 'guessing' since kgdb doesn't work. The= =20 +> next problem is that you might specify /dev/da1s1a as vinum drive but ge= t=20 +> /dev/da1s1c or even /dev/da1s1. 'Classic vinum' looked at the type fiel= d=20 +> in the disklabel, but we don't do this anymore. This is a race in GEOM. I'm using a patch for this when I running geom_mirror. I sent it to phk more than week ago (AFAIR) and I still didn't get an answer. Try if it works you: http://people.freebsd.org/~pjd/patches/geom_subr.c.16.patch --=20 Pawel Jakub Dawidek http://www.FreeBSD.org pjd@FreeBSD.org http://garage.freebsd.pl FreeBSD committer Am I Evil? Yes, I Am! --ZGfVcqCQYT4RlWas Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.4 (FreeBSD) iD8DBQFA3Z91ForvXbEpPzQRAqTLAKCy/gWOlnwsp6xazyZtO9vGkrPCrQCfS+eo ae9eR9HvYdNn9d+fFreO5BQ= =SY3v -----END PGP SIGNATURE----- --ZGfVcqCQYT4RlWas--
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