Re: MD array keeps resyncing after rebooting

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Hello Martin

On Thu, Jul 25, 2013 at 10:23 PM, Francis Moreau <francis.moro@xxxxxxxxx> wrote:
> On Thu, Jul 25, 2013 at 9:06 PM, Martin Wilck <mwilck@xxxxxxxx> wrote:
>> On 07/25/2013 08:58 PM, Martin Wilck wrote:
>>
>>> Thinking about it - you did some coding of your own to start mdmon in
>>> the initrd, right? Do you also make sure that mdadm -Ss is called after
>>> umounting the file systems, but before shutdown? If not, an inconsistent
>>> state might result.
>>
>> I forgot - mdadm -Ss needs to be run after unmounting file systems,
>> killing logical volumes, etc, but before killing mdmon.
>>
>> This can be bit tricky.
>> However if your distro supports md with IMSM, the code should be in place.
>
> I need to check how systemd shutdown the service related to DM devices.
>

This part is still not cleared to me, I need to investigate to
understand how the system stops MD device.

In the meantime I applied your patch and now I can see this from mdadm's output:

  # ./mdadm -E /dev/sda
  mdmon: load_ddf_header: header mismatch
  mdmon: load_ddf_header: header mismatch
  mdmon: load_ddf_header: header mismatch
  mdmon: Failed to load secondary DDF header on /dev/sda
  ....

Thanks
-- 
Francis
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