From mboxrd@z Thu Jan  1 00:00:00 1970
From: NeilBrown <neilb@suse.de>
Subject: Re: 0.90 vs 1.X - Differing behavior for device # during
 fail/remove/add operation
Date: Fri, 10 May 2013 07:29:06 +1000
Message-ID: <20130510072906.6d457c29@notabene.brown>
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On Thu, 9 May 2013 11:30:26 -0400 Dusty Mabe <dustymabe@gmail.com> wrote:

> On Wed, May 8, 2013 at 1:39 PM, Dusty Mabe <dustymabe@gmail.com> wrote:
> > CentOS 6.3
> > 2.6.32-279.19.1
> > mdadm-3.2.3-9.el6.x86_64
> >
> >
> > I have noticed that the device number printed in the mdstat file gets
> > changed if you fail->remove->add a member device of a 1.X metadata
> > array, but for a 0.90 metadata array the device will go back to the
> > original value once recovery has finished.
> >
> >
> > Is this by design? I know 1.X version of metadata use dev_roles rather
> > than this_disk and the mdp_disk_t structure so maybe it is by design?
> >
>=20
> Hey guys.. Sorry to be a pain. Has anyone seen this before? Is it by
> design or a known issue?
>=20
It is an unfortunate consequence of incoherent design.
I've occasionally wondered if I should "fix" it.

NeilBrown

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