[libvirt-users] virtual drive performance

[Dominik Psenner]

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 at gmail.com <mailto:gianluca.cecchi at gmail.com>> 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
>     <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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