From mboxrd@z Thu Jan  1 00:00:00 1970
From: NeilBrown <neilb@suse.de>
Subject: Re: ISW fakeraid: fail to add back a disk previously removed
Date: Sat, 9 Nov 2013 08:16:23 +1100
Message-ID: <20131109081623.25c6bfc4@notabene.brown>
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To: "Dorau, Lukasz" <lukasz.dorau@intel.com>
Cc: Francis Moreau <francis.moro@gmail.com>, "Williams, Dan J" <dan.j.williams@intel.com>, linux-raid <linux-raid@vger.kernel.org>
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On Fri, 8 Nov 2013 14:33:24 +0000 "Dorau, Lukasz" <lukasz.dorau@intel.com>
wrote:

> On Friday, November 08, 2013 2:46 PM Francis Moreau <francis.moro@gmail.c=
om> wrote:
> > > If you created a RAID array with mdadm, it would work correctly - rec=
overy would
> > > start.
> >=20
> > Nope, I've got an identical behaviour if the array is created by mdadm =
(v3.3).
> >=20
>=20
> I have checked it twice with Fedora 19 and mdadm v3.3 and it works.
> What OS are you running?
>=20
> > As you can see, I'm confused about ISW vs IMSM.
> >=20
> > Are those 2 formats the same thing ?
> >=20
>=20
> ISW is a name of Intel metadata used by dmraid and IMSM is a name of Inte=
l metadata used by mdadm, but ISW in dmraid has not been supported and deve=
loped for a couple of years, so ISW might be called an old version of IMSM.
>=20
> Lukasz

Unless we identify something in the metadata the dmraid writes which clearly
contravene the specification, we must assume there is a bug in mdadm.  I
haven't had a change to look at this properly yet but I hope to next week.

NeilBrown

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