[dm-crypt] can't open luks device after raid 5 rebuild

Arno Wagner arno at wagner.name
Mon Apr 9 01:22:05 CEST 2012

On Sun, Apr 08, 2012 at 10:43:34PM +0200, artificial11000 wrote:
> Hi guys,
> thanks for your effort.

No problem.

> Meanwhile I had to start over and format the whole device.
> I have a backup. Allthough it is not really up to date, I can work with it.

Good. So you already did something very right.


> Thanks again
> artificial
> On 04/08/2012 10:35 PM, Arno Wagner wrote:
> >On Sun, Apr 08, 2012 at 06:23:22PM +0200, artificial11000 wrote:
> >>Hi,
> >>
> >>as I noticed that I can't access the device, I recreated the raid manually.
> >>  mdadm --create --level=5 -n 3 /dev/md127 /dev/sdb /dev/sdc /dev/sdd
> >>
> >>Could this damage the key-slot?
> >>Are the metadata of the RAID relevant to this?
> >>I read that old versions of mdadm created RAIDs with metadata=0.90
> >>and the newer versions with metadata=1.20.
> >
> >This may be an additional problem or the only problem. Metadata 0.90
> >is at the end of the device. Metadata 1.20 is 4k from the start of
> >the device. The other versions are in still other places.
> >(I have no idea what messed up process created these thorougly
> >insane changes.)
> >
> >So, yes, 4k offset is right in the first key-stripe. If so,
> >then your data is pemanently gone unless you have a header-backup.
> >In this case it is also possible that the array actually assembled
> >right and the problem is _only_ the new raid metadata block.
> >
> >Arno
> >
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Arno Wagner, Dr. sc. techn., Dipl. Inform., CISSP -- Email: arno at wagner.name 
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One of the painful things about our time is that those who feel certainty 
are stupid, and those with any imagination and understanding are filled 
with doubt and indecision. -- Bertrand Russell 

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