CERC 1.5/6ch and high load averages, poor performance

[David Hubbard]

I've seen that type of issue on crap 3ware controllers,
not sure who makes Dell's cerc for sata.  What kind
of raid have you configured?

David 

> -----Original Message-----
> From: linux-poweredge-bounces at dell.com 
> [mailto:linux-poweredge-bounces at dell.com] On Behalf Of Neil Jones
> Sent: Monday, July 10, 2006 7:28 PM
> To: linux-poweredge at dell.com
> Subject: CERC 1.5/6ch and high load averages, poor performance
> 
> I have a (new) PowerEdge 1800 with a CERC 1.5/6ch controller.  It has
> a single 4 volume RAID 5 array, which is also controlled through Linux
> LVM; the system runs Red Hat Enterprise 4.
> 
> I've noticed that when any application begins to do a lot of disk I/O
> (e.g., MySQL), the load on the machine jumps up to a very high number
> (currently, 13).  The applications themselves use very little memory
> and there is no swapping going on --- all disk I/O is coming from
> explicit file I/O from an application. The only processes that seem
> active are the I/O-heavy application, kjournald, and (oddly) kswapd.
> 
> Has anybody seen this problem before, and if so, what did you 
> do about it?
> -- 
> ..Neil
> 
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