[Users] Experience with low cost NFS-Storage as VM-Storage?

[Sander Grendelman]

On Thu, Jan 9, 2014 at 9:39 AM, Markus Stockhausen
<stockhausen at collogia.de> wrote:
>> Von: squadra [squadra at gmail.com]
>> Gesendet: Donnerstag, 9. Januar 2014 09:30
>> An: Markus Stockhausen
>> Cc: Karli Sjöberg; users at ovirt.org
>> Betreff: Re: [Users] Experience with low cost NFS-Storage as VM-Storage?
>>
>> try it, i bet that you will get better latency results with proper configured iscsitarget/initiator.
>
> I guess you did not take time to read the hole post. The latency I speak
> of comes ontop the NFS latency. So my setup has
>
> - 83us latency per I/O in the hypervisor on a NFS share
> - 450us latency per I/O in the VM on a disk hosted on the same NFS share
>
> If ISCSI could reduce latency to 40us instead of 83us in our wishfulst dreams
> the QEMU penalty hits too hard.

There are some interesting tests here:
http://www.linux-kvm.org/page/Virtio/Block/Latency
Results seem to depend a lot on the guest OS IO stack/drivers (I see
you use win2k3?).