Re: High CPU usage (up to server hang) under heavy I/O load

[Lenar LÃhmus]

Tom Sightler wrote:

> On Fri, 2004-08-13 at 11:46, Sylvain COUTANT wrote:
>  
>
> During heavy writes to the drives attached to the PERC4/Di the system
> becomes practically unusable.  I've been wanting to try the 'megaraid2'
> driver to see if this gets rid of the issue but I haven't been able to
> try that yet.
>  
Can confirm same symptoms. But I can say that megaraid2 driver gets rid 
of this slowdown
(during heavy writing). Only problem you can't use dellmgr or megamon 
with this driver it seems.

> We have some older systems with PERC2/DC cards which also use the
> 'megaraid' driver but they don't seem to experience this issue so I'm a
> little suspicious that perhaps this driver simply doesn't work that well
> with the newer megaraid-like controllers.
>  
It's PERC3/QC here.

Lenar

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