From mboxrd@z Thu Jan  1 00:00:00 1970
From: Francis Moreau <francis.moro@gmail.com>
Subject: Re: MD array keeps resyncing after rebooting
Date: Thu, 8 Aug 2013 09:18:30 +0200
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Sender: linux-raid-owner@vger.kernel.org
To: Martin Wilck <mwilck@arcor.de>
Cc: linux-raid@vger.kernel.org
List-Id: linux-raid.ids

Hello Martin,

On Fri, Aug 2, 2013 at 8:19 PM, Martin Wilck <mwilck@arcor.de> wrote:
> On 08/02/2013 02:46 PM, Francis Moreau wrote:
>
>> >
>> > # mdadm -E /dev/sda | egrep "state"
>> >         state[0] : Optimal, Consistent
>> >    init state[0] : Fully Initialised
>
> This would correspond to "00 02", and it's what we should see after
> initialization. On my system the BIOS sets "00 01" (Optimal, consistent,
> Quick Init in progress) when it first creates an array, because the BIOS
> doesn't do a full initialization. But "not initialized" is weird. The
> mdadm DDF code won't set this by itself, AFAIK. Please make sure again
> that the "before" data matches what mdadm/mdmon wrote just after
> stopping during shutdown.

I did it again and got the same result: both disks have:

00000860  00 00 ff ff ff ff ff ff  ff ff ff ff ff ff ff ff  |................|

and I checked again that "mdadm -E" reported an initialized state.

Moreover this time I did a "sync" before dumping the ddf headers.

So I'm quite lost, I can see only 2 cases:

  - with my HW setup some metadata are not written to disks by the
kernel but stood somewhere in RAM (cache)

  - the state is not stored at address 00000860 (very unlikely)

  - the dumps are incorrect

How can I debug this more ?

Thanks for your help.
-- 
Francis