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xen-users
Re: [Xen-users] disk speed
Hi Sebastian,
AFAIK, you should be getting some better results. But most of my experience is with Windows HVM domUs, so unfortunately I can't offer you any more insight into your situation.
Good luck!
Dan
On 10/22/07, Sebastian Reitenbach <sebastia@xxxxxxxxxxxxxxxxxxxx> wrote:
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 > >
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