Re: virtual drive performance

[Dominik Psenner <dpsenner@xxxxxxxxx>]

Installing the virtio drivers is probably the best option, but is going to remain our last resort because it has further implications like a larger maintenance window. Thanks for pointing us towards the W2016 virtio drivers.

Your last email was a little unclear to me. Would you expect a performance boost by changing bus='ide' to bus='scsi'? For instance changing this:

<disk type='file' device='disk'>
  <driver name='qemu' type='qcow2' cache='none'/>
  <source file='/var/data/virtuals/machines/windows-server-2016-x64/image.qcow2'/>
  <backingStore/>
  <target dev='hda' bus='ide'/>
  <alias name='ide0-0-0'/>
  <address type='drive' controller='0' bus='0' target='0' unit='0'/>
</disk>

to the following:

<disk type='file' device='disk'>
  <driver name='qemu' type='qcow2' cache='none'/>
  <source file='/var/data/virtuals/machines/windows-server-2016-x64/image.qcow2'/>
  <backingStore/>
  <target dev='hda' bus='scsi'/>
  <address type='drive' controller='0' bus='0' target='0' unit='0'/>
</disk>

Do you see any gotchas in this configuration that could prevent the virtualized guest to power on and boot up?

On 2017-06-20 15:12, Gianluca Cecchi wrote:

On Tue, Jun 20, 2017 at 10:29 AM, Gianluca Cecchi <gianluca.cecchi@xxxxxxxxx> wrote:

 

That said, I don't know what is the level of support for W2016 at time with virtio and virtio-scsi drivers.

You can download iso and virtual floppy images here:

https://fedoraproject.org/wiki/Windows_Virtio_Drivers

This message below just posted at ovirt-users mailing list so that for drivers you can use this iso, that seems supporting W2016 (not tested myslef yet):

http://lists.ovirt.org/pipermail/users/2017-June/082717.html

 

Gianluca

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