[dm-crypt] migrate luks key-slots to another luks container

Arno Wagner arno at wagner.name
Wed Jan 16 22:08:40 CET 2013


On Wed, Jan 16, 2013 at 09:51:36PM +0100, Alexander 'Leo' Bergolth wrote:
> Am 16.01.2013 21:14, schrieb Arno Wagner:
> >Any reason why you want to change the cipher? After all, you can
> >not enlarge the key and keep the keyslots.
> >
> >As to size, just enlarge the partition. Offset, I don't know,
> >but if you do not need to keep any data, just changing the
> >repective fiels in the header should do it. But is there really
> >any reason to change the offset?
> 
> The motivation behind this is because I'd like to migrate the data
> to another system using a different raid layout.
> To ensure correct data alignment with the new stripe size, I need to
> change the payload-offset using --align-payload.

Ah, that makes sense. However, do you actually need this
alignment? If yor filesystem has, say, 4kB blocks and your
stripe-size is a multiple of that, it will be aligned anyways.

Arno
-- 
Arno Wagner,     Dr. sc. techn., Dipl. Inform.,    Email: arno at wagner.name
GnuPG: ID: CB5D9718  FP: 12D6 C03B 1B30 33BB 13CF  B774 E35C 5FA1 CB5D 9718
----
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are stupid, and those with any imagination and understanding are filled
with doubt and indecision. -- Bertrand Russell


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