[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 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
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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