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Re: [Xen-users] Oracle in Xen domU

On Wed, Apr 22, 2009 at 06:36:58AM -0600, Nick Couchman wrote:
> How are you storing your database files?  What file system are you using?

in dom0 domU disks are LVM volumes on iSCSI LUN.

domU is using ext3 on xvd*.

-- Pasi

> Thanks!
> - Nick
> Nick Couchman
> Manager, Information Technology 
> -----Original Message-----
> From: Pasi Kärkkäinen<pasik@xxxxxx>
> To: Nick Couchman <Nick.Couchman@xxxxxxxxx>
> Cc: XEN Mailing List <xen-users@xxxxxxxxxxxxxxxxxxx>
> Sent: 4/22/2009 1:29:02 AM
> Subject: Re: [Xen-users] Oracle in Xen domU
> 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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