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Date: Mon, 16 Jul 2007 10:50:34 -0500
From: Eric Sandeen <sandeen@sandeen.net>
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Subject: Re: 3ware 9650 tips
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To: David Chinner <dgc@sgi.com>
Cc: Justin Piszcz <jpiszcz@lucidpixels.com>, Jon Collette <jon@etelos.com>, Joshua Baker-LePain <jlb17@duke.edu>, linux-ide-arrays@lists.math.uh.edu, linux-raid@vger.kernel.org, xfs@oss.sgi.com

David Chinner wrote:
> On Mon, Jul 16, 2007 at 12:41:15PM +1000, David Chinner wrote:
>> On Fri, Jul 13, 2007 at 03:36:46PM -0400, Justin Piszcz wrote:
...
>> If you've got any sort of serious disk array, ext3 is not the filesystem
>> to use....
> 
> To show what the difference is, I used blktrace and Chris Mason's
> seekwatcher script on a simple, single threaded dd command on
> a 12 disk dm RAID0 stripe:
> 
> # dd if=/dev/zero of=/mnt/scratch/fred bs=1024k count=10k; sync
> 
> http://oss.sgi.com/~dgc/writes/ext3_write.png
> http://oss.sgi.com/~dgc/writes/xfs_write.png

Were those all with default mkfs & mount options?  ext3 in writeback
mode might be an interesting comparison too.

-Eric