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

To: "XEN Mailing List" <xen-users@xxxxxxxxxxxxxxxxxxx>
Subject: [Xen-users] Xen and I/O Intensive Loads
From: "Nick Couchman" <Nick.Couchman@xxxxxxxxx>
Date: Wed, 26 Aug 2009 10:01:13 -0600
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Hi, folks,

I'm attempting to run an e-mail server on Xen.  The e-mail system is Novell GroupWise, and it serves about 250 users.  The disk volume for the e-mail is on my SAN, and I've attached the FC LUN to my Xen host, then used the "phy:/dev..." method to forward the disk through to the domU.  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).  I was wondering if anyone has ideas on tuning the domU to handle this - is there a better way to forward the disk device through, should I try using an iSCSI software initiator in the domU, or is it just a bad idea to put an I/O load like this in a domU?  Unfortunately mapping the entire F/C card through to the domU isn't really an option - the FC card accesses other SAN volumes for the Xen host, so it needs to be present in 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!


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