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Date:      Mon, 17 May 2010 22:54:17 +0930
From:      Matt Thyer <matt.thyer@gmail.com>
To:        ticso@cicely.de
Cc:        freebsd-current@freebsd.org
Subject:   Re: fsck unable to read disk sectors
Message-ID:  <AANLkTinZqDH4jHeyk6WCccT6gSaQRTyMR7y0fr7h8d3W@mail.gmail.com>
In-Reply-To: <20100512014651.GN73283@cicely7.cicely.de>
References:  <permail-20100329221104f0889e8400006cd5-a_best01@message-id.uni-muenster.de> <3a142e751003291708nc3e110bjca1789cc807f61a2@mail.gmail.com> <AANLkTikKgJQ5iEHm8Zl45eAZY2ppsYYCkmXivVj89tXk@mail.gmail.com> <AANLkTim0zpd3iVHu-O6Zo8w_h8mtrLPdsrw9qDP0jKZM@mail.gmail.com> <20100512014651.GN73283@cicely7.cicely.de>

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On 12 May 2010 11:16, Bernd Walter <ticso@cicely7.cicely.de> wrote:
>
> On Tue, May 11, 2010 at 10:15:13PM +0200, Alexander Best wrote:
> > i've posted a log here which is pretty self explanatory:
> >
> > http://pastebin.com/tn3NiDDW
> >

[snip]

>
> One of the typical problems users have is that they forget that
> adding a label takes one sector, so the labeled device is smaller.
> This is no problem if you create the filesystem on the labeled
> drive, but often enough people add the label after creating the
> filesystem.

FreeBSD's utilities should be able to detect this situation and either
correct the filesystem size or refuse to apply the label.

> Everything seems to work fine until the FS decides to use that special
> sector.
> I wouldn't add a label for ufs anyway, since UFS has labeling itself,
> which is also handled by glabel module and doesn't require extra space.
> Just setup the ufs label with tunefs -L and use the resulting /dev/ufs/...
> device.
> You only need extra label for swap, but this is not problem, since
> it has no persistent ondisk structures.
>

[snip]

> --
> B.Walter <bernd@bwct.de> http://www.bwct.de
> Modbus/TCP Ethernet I/O Baugruppen, ARM basierte FreeBSD Rechner uvm.
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