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-   -   Proper alignment between disk HW blocks, mdadm strides, and ext[23] blocks (http://www.linux-archive.org/ext3-users/856-proper-alignment-between-disk-hw-blocks-mdadm-strides-ext-23-blocks.html)

Andreas Dilger 11-15-2007 05:06 PM

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

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