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From: Andre Noll <maan@systemlinux.org>
To: NeilBrown <neilb@suse.de>
Cc: Doug Ledford <dledford@redhat.com>,
	Matthias Urlichs <matthias@urlichs.de>,
	linux-raid@vger.kernel.org
Subject: Re: RAID1 assembled broken array
Date: Thu, 17 Sep 2009 10:25:28 +0200	[thread overview]
Message-ID: <20090917082528.GO5174@skl-net.de> (raw)
In-Reply-To: <65549e07fd6559855af68b60783213c3.squirrel@neil.brown.name>

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On 07:01, NeilBrown wrote:
> > Wrong lesson.  The correct lesson to gather from this is to prefer
> > version 1.1 or 1.2 superblocks wherever possible.  Superblocks at the
> > beginning of the device disappear when there is no partition table,
> > superblocks at the end can be confused for superblocks belonging to
> > the whole device when there is no partition table.
> 
> 1.0 also protects from this problem.  The 1.x metadata stores the
> offset of the superblock from the start of the device.  That will appear
> to be wrong if you find a partition-superblock when reading from a
> whole-device, so mdadm will reject the device as not having a valid
> superblock.

BTW: Why are new arrays still created with 0.90 metadata format by
default?

Andre
-- 
The only person who always got his work done by Friday was Robinson Crusoe

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  parent reply	other threads:[~2009-09-17  8:25 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2009-09-15 19:22 RAID1 assembled broken array Matthias Urlichs
2009-09-15 19:24 ` Majed B.
2009-09-15 19:33   ` Matthias Urlichs
2009-09-15 19:43     ` Majed B.
2009-09-15 20:04       ` Doug Ledford
2009-09-15 20:00 ` Doug Ledford
2009-09-15 20:27   ` Matthias Urlichs
2009-09-15 21:01   ` NeilBrown
2009-09-16  4:50     ` Matthias Urlichs
2009-09-17 16:44       ` Doug Ledford
2009-09-17 17:09         ` Matthias Urlichs
2009-09-17 17:12           ` Majed B.
2009-09-25  8:07           ` Neil Brown
2009-09-17  8:25     ` Andre Noll [this message]
2009-09-25  8:12       ` Neil Brown
2009-09-25 10:42         ` Chris Webb
2009-09-26  9:58         ` Andre Noll
2009-09-26 13:01           ` John Robinson
2009-09-26 19:21             ` Clinton Lee Taylor
2009-09-28 16:12               ` Andre Noll

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