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