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 -- ____________________________________________________________ / Erwan MAS /\ | mailto:erwan@xxxxxxxxxx |_/ ___|________________________________________________________ | \___________________________________________________________\__/ -- To unsubscribe from this list: send the line "unsubscribe fio" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html