On 19/07/10 04:53, Roman Mamedov wrote:

On Sun, 18 Jul 2010 17:32:25 -0700
Konstantin Svist[off-list ref]  wrote:

quoted

I looked around and found that chunk size
of 512 should work better.

Not true, at least with RAID5/6 a chunk size of 64K performs faster, see
http://louwrentius.blogspot.com/2010/05/raid-level-and-chunk-size-benchmarks.html
http://alephnull.com/benchmarks/sata2009/chunksize.html

There is no mention in this benchmark tests if he modified the stripe 
cache. With an increased stripe size a larger stripe cache would be 
needed for good performance (at least from my experience)

Best Regards

Jools