On Sun, 2013-07-07 at 20:50 +0200, Milan Broz wrote:

For LUKS is it trivial, LVM is more complex
but should align to MD chunk/stripe properly as well.

Shouldn't one get that automatically by simply setting the
--dataalignment of the PVs to a multiple of the chunk size (or even
better of the stripe size)... and shouldn't the default alignment
against the 1MiB boundary (as in LUKS) work just well?
Is there any other hidden complexity I haven't realised, yet (when
aligning LVMs on top of MD, optionally with LUKS in between)?

TBH I have no idea, I no longer work for Red Hat (which maintains DM).

:(

My response to these patches is still the same, see
http://permalink.gmane.org/gmane.linux.kernel/1464414

Well I haven't that detailed insight for sure... but your arguments
sound quite reasonable ;)


Thanks again for answering here :) I think many users of stacked
MD/dmcrypt setups may benefit from this.


Cheers,
Chris.