SAS 6/iR write performance depends on kernel version, blade server m600

Tino Schwarze linux-poweredge.lists at tisc.de
Wed Jun 4 10:47:37 CDT 2008


On Wed, Jun 04, 2008 at 05:34:13PM +0200, LALOT Dominique wrote:

> Well, it appears that in fact, there is a change in 2.6.22 about MM and
> there is less memory for write caching. So if you stay under 80Mo, it works
> well. After you get disk performance. We also check it against SATA devices
> and we observed it was not related to hardware.

BTW: You should always use sizes a lot larger than your main memory to
get past caching issues. Or better yet, use bonnie++ or similar
performance measurement tools to get real-world values.

Tino.

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