Re: [dm-crypt] Improving performance?

[Arno Wagner <arno@wagner.name>]

On Thu, Nov 11, 2010 at 07:56:30PM +0100, Markus Krainz wrote:
>
> On 2010-11-11 19:26, Lasse Jensen wrote:
>> I havent tested my current setup this way, but my old setup, RAID  
>> first, then encryption worked fine.
>
> RAID first, den ecryption works for me, too.
> But testing the ecrypting drives seperately, then RAID approach failed.
> What good is fast performance if the RAID 5 does not work? :D

I Have not tried encytion first, but I have several 3-way RAID1
with RAID first runnign without a problem for > 2 years now.
(It is partition RAID1, only 3 disks involved.)

I would imagine that encryption-first is a bit of a risk until
the kernel barriers have been cleaned up. BTW, I see significantly
better behavior with 2.6.36. Hope they manage to clean this mess 
up by 2.6.37. The kernel used to be tunable to not slow to a crawl
when writing large amounts of data onto slow devices. One of the
ugly secrets up to 2.6.35.

Arno
-- 
Arno Wagner, Dr. sc. techn., Dipl. Inform., CISSP -- Email: arno@wagner.name 
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