[CentOS] Hardware RAID Controller

[Pasi Pirhonen]

Hi,


On Wed, May 11, 2005 at 12:23:30PM +0100, John Moylan wrote:
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> That's for the PATA cards. I don't think that the 9500-S cards are
> effected by this.
> 
> BTW, I have noticed that RHEL 3U5 Beta has a lot of additions  and
> improvements to the  3ware drivers in their changlist.
> 
> 
> 
> J
> 
> Chris Croome wrote:
> | Hi
> |
> |
> | - Extremely high iowait with 3Ware array and moderate disk activity
> |   https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=121434
> |


Please don't TOP-post. 

But the fact is that even 9500S-x is affected with RHEL3-level kernel.
SMP will trigger easily the 'sluggish behaviour' with ext3. 
I've not veen able to trigger this with UP kernel tho.
Patching XFS in and using that, won't trigger any anomalities anymore.

The problem isn't actually high I/O wait. It's perfectly OK to have
high I/O wait. The problem is that the write performance drops below
1MB/s and stays there as long as the constant writing continues.
Sometimes it can go allright _some minutes_, but it'll manifest itself
really easy.




-- 
Pasi Pirhonen - upi at iki.fi - http://iki.fi/upi/