[ovirt-users] Poor guest write speeds

[Donny Davis]

Are you using virtio-scsi in oVirt?
On Jul 28, 2015 1:50 PM, "Alan Murrell" <lists at murrell.ca> wrote:

> For my latest test, I installed CentOS7 on my server and then installed
> the libvirt/KVM virtualization group.  I created a Win7 guest VM giving it
> 2GB RAM, 1 vCPU, and 60GB HDD. I did not specify anything for the HDD type;
> just whatever the default is for libvirt.
>
> The install of Win7 went *way* faster than any bare metal install I have
> ever done of Win7, and also faster than the ESXi install I had done earlier.
>
> Once installed, I downloaded the same "Parkdale" HDD testing application I
> have been using, and used the same settings.  The write test results were
> about 100 MByte/s.  I ran the test several times, including rebooting
> between tests, and the results came back consistent.
>
> As a baseline, I ran the following modified 'dd' write test on the server
> itself:
>
> dd bs=1M count=4000 if=/dev/zero of=test conv=sync
>
> with the following results:
>
> 4000+0 records in
> 4000+0 records out
> 4194304000 bytes (4.2 GB) copied, 39.349 s, 107 MB/s
>
> So now the question becomes, why would I be getting such a huge difference
> in oVirt?
>
> Thanks.
>
> -Alan
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