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Date:      Thu, 25 Jul 2013 22:23:44 +0200 (CEST)
From:      =?ISO-8859-1?Q?Trond_Endrest=F8l?= <Trond.Endrestol@fagskolen.gjovik.no>
To:        =?UTF-8?Q?=C5=81ukasz_W=C4=85sikowski?= <lukasz@wasikowski.net>
Cc:        FreeBSD stable <freebsd-stable@freebsd.org>
Subject:   Re: ZFS: can't read MOS of pool
Message-ID:  <alpine.BSF.2.00.1307252202420.35028@mail.fig.ol.no>
In-Reply-To: <51F17233.4080903@wasikowski.net>
References:  <51ED5B69.8050200@wasikowski.net> <alpine.BSF.2.00.1307251813170.35028@mail.fig.ol.no> <51F17233.4080903@wasikowski.net>

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On Thu, 25 Jul 2013 20:45+0200, ?ukasz W?sikowski wrote:

> W dniu 2013-07-25 18:40, Trond Endrestøl pisze:
> 
> >> Any hints how to go from here?
> > 
> > I'm only subscribed to freebsd-stable@, but as far as I can tell, no 
> > one from freebsd-fs@ nor freebsd-stable@ has yet replied. I'm only 
> > replying to freebsd-stable@.
> > 
> > First, just some quick questions:
> > 
> > Have you by chance upgraded the pool format without upgrading the boot 
> > blocks? Or was the pool already at 5000?
> > 
> > You didn't mention if you have made any attempt at updating the boot 
> > blocks after playing with ezjail-admin.
> > 
> > Perhaps you should consider updating the boot blocks once more:
> > 
> > 1. Boot from the live CD.
> > 
> > 2. Import the pool read-only without mounting any fs:
> > 
> > zpool import -f -N -o readonly=on klawisz
> > 
> > 3. Mount the root fs read-only:
> > 
> > mount -r -t zfs klawisz/ROOTFS /tmp/zroot
> > 
> > 4. Update the boot blocks from the files stored in the root fs:
> > 
> > gpart bootcode -b /tmp/zroot/boot/pmbr -p /tmp/zroot/boot/gptzfsboot -i 1 ada0
> > 
> > 5. Unmount the root fs:
> > 
> > umount /tmp/zroot
> > 
> > 6. Reboot the system, do NOT export the pool.
> > 
> > Hopefully, the updated gptzfsboot stored in ada0p1 will be able to 
> > read the MOS.
> > 
> > That's all I can think of at the moment.
> > 
> > Best of luck.
> 
> Thank you for your reply. The pool was created with version 5000. I have
> updated the boot blocks before (but with exporting pool after). I don't
> think that ezjail-admin has anything to do with booting.

Never ever leave a pool you intend to boot from in the exported state. 
Period. ;-)

At least that was a big no-no when I started using ZFS a couple of 
years ago. Maybe this has changed since FreeBSD no longer relies on 
the zpool.cache file.

> I did as you suggested and it didn't help, still MOS can't be read. I'm
> pretty sure I can reproduce this problem. I will try to do detailed
> guide and post it here.

Reading through your post once more, 
http://pastie.org/private/mtfhkx0wx0vve29xn0plw , I noticed the 
following:

1. The bootfs property is set to klawisz/ROOTFS for the klawisz pool.

2. The mountpoint property is set to / for the klawisz filesystem.

3. The mountpoint property is set to legacy for the klawisz/ROOTFS filesystem.

Maybe item 2 is the cause of all this confusion. I see nothing wrong 
with items 1 and 3.

Perhaps you should reset the mountpoint property for klawisz, using:

zfs set mountpoint=legacy klawisz

At the same time you may let klawisz/ROOTFS inherit the mountpoint 
property from klawisz by running:

zfs inherit mountpoint klawisz/ROOTFS

You should also check the mountpoint properties of all the other 
filesystems you intend to mount automatically.

-- 
+-------------------------------+------------------------------------+
| Vennlig hilsen,               | Best regards,                      |
| Trond Endrestøl,              | Trond Endrestøl,                   |
| IT-ansvarlig,                 | System administrator,              |
| Fagskolen Innlandet,          | Gjøvik Technical College, Norway,  |
| tlf. mob.   952 62 567,       | Cellular...: +47 952 62 567,       |
| sentralbord 61 14 54 00.      | Switchboard: +47 61 14 54 00.      |
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--2055831798-1228286545-1374783824=:35028--



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