Hi;
Today i noticed that when you create a Centos 7 vm by choosing os type as
CentOS7 then the created vm did not use virtio it uses old hda/ide access
technique this problem makes Centos 7 vm's to boot slowly, i nearly wait 30
seconds after grub loads for CentOS 7. When i change this value to virtio
it boots without any wait.

So how could i change this Centos 7 vm's default disk access type to
virtio? This problem creates real headache on my system :)

Example CentOS libvirt disk part:
    <emulator>/usr/bin/kvm-spice</emulator>
    <disk type='network' device='disk'>
      <driver name='qemu' type='raw' cache='none'/>
      <auth username=xx'>
        <secret type='ceph' uuid='xsw'/>
      </auth>
      <source protocol='rbd'
name='jacknode/4e2cd1be-5c7f-43ff-b44b-bf9f87e84b19'>
        <host name='172.16.44.22' port='6789'/>
      </source>
*      <target dev='hda' bus='ide'/>*
      <address type='drive' controller='0' bus='0' target='0' unit='0'/>
    </disk>

Example Ubuntu Trusty libvirt disk part:
    <disk type='network' device='disk'>
      <driver name='qemu' type='raw' cache='none'/>
      <auth username='xx'>
        <secret type='ceph' uuid='xsw'/>
      </auth>
      <source protocol='rbd' name='xx/cfafb241-b9c7-4d41-acdc-aac937d96a19'>
        <host name='172.16.44.22' port='6789'/>
      </source>
 *     <target dev='vda' bus='virtio'/>*
      <address type='pci' domain='0x0000' bus='0x00' slot='0x04'
function='0x0'/>
    </disk>

Thanks
Özhan Ruzgar Karaman

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