[libvirt-users] Changing default nic and storage types

Daniel P. Berrange berrange at redhat.com
Wed Nov 17 12:00:56 UTC 2010

On Wed, Nov 17, 2010 at 02:38:49PM +0800, Osier Yang wrote:
> 于 2010年11月16日 21:30, Chris Phillips 写道:
> >Hi,
> >
> >Simple question that I can't track down any notable discussion about,
> >let alone an answer...
> >
> >Is it possible to define what the "default" nic and storage types are?
> >I am deploying images out of cobbler using koan and all of them are
> >running virtio wherever applicable, but this is not the default, and
> >at present there is no way within koan or cobbler to define what type
> >of devices they should be. I've hard coded this device type
> >declaration into koan, but don't like that in the slightest, and would
> >typically expect to be able to just set "default=virtio" in a libvirt
> >config file somewhere.
> >
> >I fear I'm actually not missing anything and it's just hard coded for
> >the most compatible device with no recourse to override it.
> >
> It seems reasonable to add a new preference in "/etc/libvirt/qemu.conf".
> Now libvirt use "ide" as the bus type for disk device if it fails on
> the series detections.

No, this isn't the right place to address this. The reason we don't
default to virtio is that actually very few operating systems support
virtio. Any change in global defaults never fixes the problem, it
just moves the problem around. The right answer to this is the libosinfo
library which provides a comprehensive & customizable database of
per-OS default hardware settings (and much more besides). 

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