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From: "Erik Hjelmås" <erik.hjelmas@gmail.com>
To: linux-bcache@vger.kernel.org
Subject: Re: cannot attach backing device, wipefs does not fix it
Date: Wed, 18 Jun 2014 17:11:22 +0000 (UTC)	[thread overview]
Message-ID: <loom.20140618T185645-94@post.gmane.org> (raw)
In-Reply-To: 1297031660.20140618230148@pvgoran.name

> > Hi, ubuntu 14.04, and a 5TB RAID (sdc) partitioned into two 2.5TB partitions
> > (sdc1 and sdc2) with parted to be used as backing devices, 
> 
> > /dev/sdc2 attaches fine
> 
> > problem with sdc1:
> 
> > # make-bcache -B /dev/sdc1
> > Device /dev/sdc1 already has a non-bcache superblock, remove it using wipefs
> > and wipefs -a
> 
> > # wipefs /dev/sdc1
> > wipefs: WARNING: /dev/sdc1: appears to contain 'dos' partition table
> 
> > # wipefs -a /dev/sdc1
> > wipefs: WARNING: /dev/sdc1: appears to contain 'dos' partition table
> 
> Did you try wipefs -a -f /dev/sdc1 ?

my wipefs does not have a -f option
 
> If that fails, just erase the first few MB of the device with zeroes:
> 
> dd if=/dev/zero of=/dev/sdc1 bs=1M count=10

I had tried this, but I see now that I copied from /dev/null instead of
/dev/zero and no data got copied :)

so, yes, your suggestion dd if=/dev/zero of=/dev/sdc1 bs=1M count=10 fixed it

thank you Pavel!

/Erik

      reply	other threads:[~2014-06-18 17:11 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-06-18 15:38 cannot attach backing device, wipefs does not fix it Erik Hjelmås
2014-06-18 16:01 ` Pavel Goran
2014-06-18 17:11   ` Erik Hjelmås [this message]

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