WARNING - OLD ARCHIVES

This is an archived copy of the Xen.org mailing list, which we have preserved to ensure that existing links to archives are not broken. The live archive, which contains the latest emails, can be found at http://lists.xen.org/
   
 
 
Xen 
 
Home Products Support Community News
 
   
 

xen-users

Re: [Xen-users] disk speed

To: dverweire@xxxxxxxxx, xen-users@xxxxxxxxxxxxxxxxxxx
Subject: Re: [Xen-users] disk speed
From: "Sebastian Reitenbach" <sebastia@xxxxxxxxxxxxxxxxxxxx>
Date: Mon, 22 Oct 2007 18:22:06 +0200
Delivery-date: Mon, 22 Oct 2007 09:22:56 -0700
Envelope-to: www-data@xxxxxxxxxxxxxxxxxx
List-help: <mailto:xen-users-request@lists.xensource.com?subject=help>
List-id: Xen user discussion <xen-users.lists.xensource.com>
List-post: <mailto:xen-users@lists.xensource.com>
List-subscribe: <http://lists.xensource.com/cgi-bin/mailman/listinfo/xen-users>, <mailto:xen-users-request@lists.xensource.com?subject=subscribe>
List-unsubscribe: <http://lists.xensource.com/cgi-bin/mailman/listinfo/xen-users>, <mailto:xen-users-request@lists.xensource.com?subject=unsubscribe>
Organization: L00 bugdead prods.
Reply-to: Sebastian Reitenbach <sebastia@xxxxxxxxxxxxxxxxxxxx>
Sender: xen-users-bounces@xxxxxxxxxxxxxxxxxxx
Hi Dan,

"Dan VerWeire" <dverweire@xxxxxxxxx> wrote: 
> Are you using PV or HVM DomU's? If HVM, this may be expected as the block
> device presented to the DomU is an emulated device in Dom0. Someone 
correct
> me if I am wrong please.
> 
thanks for your insights. I am running paravirtualized machine, so if I 
understand correct, I should get sth. different?

Sebastian

> Dan
> 
> On 10/22/07, Sebastian Reitenbach <sebastia@xxxxxxxxxxxxxxxxxxxx> wrote:
> >
> > Hi,
> >
> > I started to experiment with xen, so I am still new to it. I was 
impressed
> > how easy I got my first virtual node up and running.
> > I measured the disk speed, created a 1gb file with dd.
> > copying that file on the dom0 always took about 5 seconds, on the domU, 
it
> > took about 15-20seconds. I used "time cp large_file large_file2" to
> > measure
> > the speed. I only expected a small time difference, but not factor 3-4.
> > My virtual disk is a physical device, configured like this:
> > disk=[ 'phy:/dev/sdv2,xvda,w', ]
> >
> >
> > As far as I know, using the physical partitions as the virtual disk,
> > should
> > be the fastest solution for virtual disks, compared to files.
> >
> > Are there different ways to present a physical partition from dom0 to a
> > domU, that would influence the speed? Or is the speed factor I have seen
> > above the one to expect?
> >
> > I am on sles10sp1 x86_64.
> >
> > kind regards
> > Sebastian
> >


_______________________________________________
Xen-users mailing list
Xen-users@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-users

<Prev in Thread] Current Thread [Next in Thread>