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I take that back...iostat in dom0 shows similar results to iostat in domU. As suggested by another person, I've changed the dom0 elevator to noop and the domU to deadline. I'm playing with tuning some of the parameters for the deadline scheduler, now.
-Nick
>>> On 2009/08/26 at 11:32, Pasi Kärkkäinen<pasik@xxxxxx> wrote:
On Wed, Aug 26, 2009 at 10:01:13AM -0600, Nick Couchman wrote:
>
> Hi, folks,
> The disk volume for the e-mail is on my SAN, and I've attached the FC LUN to my Xen host
Does the SAN LUN perform OK from dom0 without any domUs running?
> I'm running into an issue with high I/O wait on the box (~250%) and large load averages (20-40 for the 1/5/15 minute average).
Do you have iowait on dom0, or only in domU?
Try running "iostat 1" in both dom0 and domU.
Also, have you dedicated a cpu core only for dom0?
> I'm running Xen 3.2.0 on SLES 10 SP2, on a Dell PowerEdge R610 server. The FC HBA is a QLE2462, dual-channel 4Gb FC card. Any help, hints, etc., are greatly appreciated!
You could also try updating to SLES11.
-- Pasi
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