[dm-crypt] Reconsidering default options for cryptsetup-reencrypt

Arno Wagner arno at wagner.name
Fri Nov 23 10:27:42 CET 2012

On Fri, Nov 23, 2012 at 10:00:47AM +0100, Milan Broz wrote:
> On 11/23/2012 07:07 AM, Arno Wagner wrote:
> > I think you do. I also think that HW raid is a bit exotic on Linux
> > these days, as SW RAID gives better features and often better
> > performance.
> If you work in enterprise environment, this is definitely not true :)

It depends. I have used a 12-way SAS RAID controller as 
dumb controller with software-RAID and have gotten better 
results. But that was one with Linux support that sucked.
With good Linux support, that may be entirely different.

On the exotic, I agree that in enterprise environments
HW controllers are the norm, but I think by now that is
mainly because they are simpler to use.
> And for some strange reasons, cloud environments are more
> and more popular where "elastic" storage means usually some
> virtualized HW storage array.

Ah, yes. The "cloud" stuff, where all your data turns into
hot vapor. I really do not get why people think using
even more complex environments that they do not even fully
control is a good idea when we obviously have not even mastered
simpler systems...
> Also there are SSD drives which uses internally RAID0 to speed
> up operations (in reality it is more independent SSD drives inside).

Ok, but I think _that_ does not count, unless you know of some
that expose the controller. ;-)

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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