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Date:      Wed, 11 Apr 2007 00:18:06 +0200
From:      Pawel Jakub Dawidek <pjd@FreeBSD.org>
To:        Max Laier <max@love2party.net>
Cc:        freebsd-current@freebsd.org, Johan Hendriks <Johan@double-l.nl>
Subject:   Re: lost zfs pool after buildworld
Message-ID:  <20070410221806.GH90135@garage.freebsd.pl>
In-Reply-To: <200704102300.49972.max@love2party.net>
References:  <57200BF94E69E54880C9BB1AF714BBCB01115B@w2003s01.double-l.local> <200704102300.49972.max@love2party.net>

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On Tue, Apr 10, 2007 at 11:00:42PM +0200, Max Laier wrote:
> On Tuesday 10 April 2007 22:54, Johan Hendriks wrote:
> > I had created a zfs pool of two disks (da1 and da2).
> >
> > # zpool create tank mirror /dev/da1 /dev/da2
> > then created the dir
> > # zfs create tank/samba
> > and the mount point
> > #zfs set mountpoint=3D/usr/local/samba tank/samba
> >
> > it all worked well.
> > this was after zfs was put to head the same hours after.
> > Now i have cvsupped the system did a buildworld and my pool is gone.
> > zpool list says no pool defined.
> >
> > I did the installworld from a remote location so zfs was active during
> > installworld, and zfs module loaded.
> >
> > Must i unload zfs next time?
> > I have recreated the pool now ( no important data) but is this normal
> > or is it bad luck.
> >
> > And is there a way to let zpool see the metadata (if any) on the disk.
>=20
> You probably didn't catch the etc/zfs/zpool.cache -> boot/zfs/zpool.cache=
=20
> change.  A simple zpool import should get you back up again.

There were actually two changes that could "break" it - mentioned
zpool.cache move and hostid stuff. One can recover from both by doing:

	# zpool import -f <pool>

--=20
Pawel Jakub Dawidek                       http://www.wheel.pl
pjd@FreeBSD.org                           http://www.FreeBSD.org
FreeBSD committer                         Am I Evil? Yes, I Am!

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