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Re: [Xen-users] Re: Xen Disk I/O performance vs native performance: Xen

To: DOGUET Emmanuel <Emmanuel.DOGUET@xxxxxxxx>
Subject: Re: [Xen-users] Re: Xen Disk I/O performance vs native performance: Xen I/O is definitely super super super slow
From: "Fajar A. Nugraha" <fajar@xxxxxxxxx>
Date: Thu, 12 Feb 2009 20:28:12 +0700
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On Thu, Feb 12, 2009 at 5:47 PM, DOGUET Emmanuel
<Emmanuel.DOGUET@xxxxxxxx> wrote:
> Dom0 have same speed on Older or New. only domU is x2 slower minmum. (with
> Oracle and dd ony 5Gb file)

You're not giving enough details.
- Do you use PV or HVM domU?
- what backend you use for domU's disk? file: ? tap:aio:? phy:?

I'm guessing you probably use tap:aio. Try using phy: (i.e. using disk
/ partition / LVM as domU backend storage)

> I must try it on the future platform... but it's necessary to have
> hard-drive/RAID only for dom0?

If I understand your question correctly, the answer is yes. Dom0
should handle all redundancy (be it hardware or software raid). You
don't need raid on domU if it's already done on dom0.



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