From: Neil Brown <neilb@suse.de>
To: Andre Noll <maan@systemlinux.org>
Cc: Jim Paris <jim@jtan.com>, linux-raid@vger.kernel.org
Subject: Re: Zeroing multiple superblocks
Date: Fri, 29 Jan 2010 23:31:11 +1100 [thread overview]
Message-ID: <20100129233111.5c9cc1d0@notabene> (raw)
In-Reply-To: <20100125095221.GV21495@skl-net.de>
On Mon, 25 Jan 2010 10:52:21 +0100
Andre Noll <maan@systemlinux.org> wrote:
> On 15:09, Jim Paris wrote:
>
> > I guess the only way to be fully safe with the current approach is to
> > do a zero-superblock over and over until it complains.
>
> mdadm --zero-superblock tries to guess the location of the superblock.
> If more than one superblock is found, the one with the latest creation
> time is being zeroed. So yes, the method you describe works and I think
> it is the most reliable way to remove all superblocks of a device.
>
> Maybe we could teach mdadm --zero-superblock to honor the --metadata=x
> option which would zero-out the region of the device where the
> version-x superblock is located.
Latest mdadm has this feature.
And if --metadata= isn't given, it repeatedly trying to find and zero a
superblock until no more superblocks can be found.
NeilBrown
next prev parent reply other threads:[~2010-01-29 12:31 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-01-22 20:09 Zeroing multiple superblocks Jim Paris
2010-01-25 9:52 ` Andre Noll
2010-01-29 12:31 ` Neil Brown [this message]
2010-02-01 21:22 ` Bill Davidsen
2010-02-01 21:44 ` Neil Brown
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