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Re: [Xen-users] Oracle in Xen domU

To: Nick Couchman <Nick.Couchman@xxxxxxxxx>
Subject: Re: [Xen-users] Oracle in Xen domU
From: Pasi Kärkkäinen <pasik@xxxxxx>
Date: Wed, 22 Apr 2009 10:29:02 +0300
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On Tue, Apr 21, 2009 at 03:41:54PM -0600, Nick Couchman wrote:
> Hi, everyone, 
> I'm currently using Oracle 10G inside of a Xen domU (SLES10 for both dom0 and 
> domU).  
> In order to get my SAN storage for the database through to the VM, I used a 
> phy: disk mapping on the domU configuration and pointed it at the SAN volume. 
> I'm using Standard Edition One, so I created a filesystem (ext3) and put my 
> Oracle database there.  
> I'm now having issues with really high I/O wait times inside the domU when 
> the database is doing 
> anything more than really light transactions.  Can anyone suggest some tuning 
> I might do to improve 
> performance and get this I/O wait time down?  The SAN volume is attached via 
> 4Gb iSCSI on a Qlogic card, 
> and the dom0 isn't seeing any high I/O wait or anything like that. 

I'm running Oracle 10g on PV domU, no problems at all. domU disk is on iSCSI 
LUN, from Equallogic iSCSI SAN.

dom0 is RHEL 5.2, and domU is RHEL 5.2 aswell.

No high io-wait here.

I'd suggest you to benchmark your SAN/LUN setup on dom0 first, and when
you're sure it's all OK, start benchmarking and tweaking from domU.

I can't remember doing anything special for my setup.. 

-- Pasi

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