Re: Striping does not increase performance.

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On Mon, Mar 12, 2012 at 01:34:08PM +0100, Caspar Smit wrote:
> Hi all,
> 
> I don't know exactly which mailinglists to use for this one so I hope
> i used the right ones.
> 
> I did some performance testing on a new system and found out some
> things I couldn't explain or didn't expect.
> At the end are some questions I hope to get answered to explain the
> tings i'm seeing in the test.
> 
> First of all a description of my setup.
> 
> The server is a 36 bay 3,5" supermicro chassis filled with 36x 2TB
> SATA 7200 RPM disks. 
> [../..]

Please check alignement of each level of stockage . 
Because this disk present to controller a block size of 512 bytes , but internal 
use a 4k block size .

You must check that alignement is correct for :
  disk partionnemnt  
  md device          
  pv lvm             

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    / Erwan MAS                                                 /\
   | mailto:erwan@xxxxxxxxxx                                   |_/
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