Proper alignment between disk HW blocks, mdadm strides, and ext[23] blocks

[Andreas Dilger]

On Nov 15, 2007  08:42 -0500, Justin Piszcz wrote:
> Quick question Andreas, if you do not provide a -E stride=16 on a RAID5 
> filesystem, how much worse does the performance become on say a 2.0 or 
> 5.0TB ext3 filesystem?

Sorry, I don't have any numbers on that.  It really depends on the back-end
RAID hardware and the IO load.  If it has a write cache it might not be any
significant overhead.

Cheers, Andreas
--
Andreas Dilger
Sr. Software Engineer, Lustre Group
Sun Microsystems of Canada, Inc.