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

artificial11000 artificial11000 at googlemail.com
Sun Apr 8 22:43:34 CEST 2012

Hi guys,

thanks for your effort.
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.

Thanks again


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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