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Re: [Xen-users] disk backend performance

To: Thomas Halinka <lists@xxxxxxxxx>
Subject: Re: [Xen-users] disk backend performance
From: Stefan de Konink <stefan@xxxxxxxxx>
Date: Fri, 28 Nov 2008 15:41:06 +0100 (CET)
Cc: Guillaume <guillaume.chardin@xxxxxxxxx>, Xen Users <xen-users@xxxxxxxxxxxxxxxxxxx>, Stefan de Konink <stefan@xxxxxxxxx>
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On Fri, 28 Nov 2008, Thomas Halinka wrote:

> Am Freitag, den 28.11.2008, 10:54 +0100 schrieb Stefan de Konink:
> > On Fri, 28 Nov 2008, Guillaume wrote:
> >
> > > I ask me some questions about xen disk backend performance. What is the
> > > better backend to use to have the best ones.
> > >
> > > For me I tought its better to use phy: than disk: , because it's does'nt
> > > need "encapsulation" to store data in and so, writing data is quicker. But
> > > maybe i'm wrong.
> > > Maybe some of you can give advise and more info about that !
> >
> > iSCSI + pvSCSI seems to be optimal I guess.
> iSCSI is pretty slow, because of all the tcp-ip overhead. Try AoE since
> its Layer 2 (Ethernet)

Please come with benchmarks, and preferably stability comparisons. Never
the less, AoE would still process on dom0, while pvSCSI is directly done
on the domU.


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