Paul,

Thanks for the article. Interesting. The server will be an AMD with AES 
extensions, but I wonder how that same machine in the article would have 
performed with a hardware raid controller verses using a software raid. 
I know certain raid configurations are a bit faster with the software 
raid but I would imagine this is not one of them. If the server has the 
basic over-head of encryption on top of the over-head of managing raid 
on top of the over-head of managing the LVM I could see a lot more CPU 
use than if the CPU was only dealing with encryption on a hardware raid 
without LVM.

Nathan

On 4/2/2013 9:11 AM, Paul Mooring wrote:
> Not really, encrypting data has overhead in terms of CPU:
>
> Benchmarks are generally awful as you care about real world impact (like
> it use to take .3 seconds now it takes .5) and benchmarks are the quickest
> route to getting hung up on theoretical numbers rather than worthwhile
> metrics.  That being said, here's one anyway:
>
> http://dentarg.it64.com/content/luks-ext4-performance
>
>
>

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