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Re: [Xen-users] Xen and I/O Intensive Loads

To: "Pasi Kärkkäinen" <pasik@xxxxxx>
Subject: Re: [Xen-users] Xen and I/O Intensive Loads
From: "Nick Couchman" <Nick.Couchman@xxxxxxxxx>
Date: Wed, 26 Aug 2009 11:40:16 -0600
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1) Yes, it seems to, although I've not run my e-mail server inside my dom0, yet - that's not really possible.

2) Just on domU - dom0 seems fine.

3) No, I haven't played around much with pinning dom0 or any of the domUs to certain CPU cores.

4) Updating to SLES11 is in the future; however, doing this requires that I do it to all my production Xen nodes concurrently, since the OCFS2 filesystem doesn't really play nice with other versions.  I can either have it mounted on the SLES10 box(es) or the SLES11 box(es), but not both at the same time.



>>> 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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