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With Havana+ you should be able to use the new block_device_mapping code to specify a particular bus during launch, but for Grizzly you can specify the bus by setting metadata on the image in glance.

glance image-update <uuid> --property hw_disk_bus=ide

There are a few properites like this, see https://wiki.openstack.org/wiki/LibvirtCustomHardware

Vish

On Sep 20, 2013, at 6:30 PM, Pattabi Ayyasami <pattabi at Brocade.com> wrote:

> Hi,
>  
> We have a KVM qcow2 image to be launched on a KVM host. From Dashboard, I don’t find a way to specify the disk type for a new instance as IDE. The instance was launched with a virtio disk type.
>  
> virsh dumpxml <kvm_vm_name>
> shows the following.
>  
> ….
>     <disk type='file' device='disk'>
>       <driver name='qemu' type='qcow2' cache='none'/>
>       <source file='/opt/stack/data/nova/instances/2f317b2e-f3b8-40cd-ba79-402231ccee51/disk'/>
>       <target dev='vda' bus='virtio'/>
>       <address type='pci' domain='0x0000' bus='0x00' slot='0x08' function='0x0'/>
>     </disk>
> ….
> I want it to be
>       <target dev=’vda’ bus=’ide’/>
>       <address type='drive' controller='0' bus='0' unit='0'/>
>  
>  
> The libvirt.xml under data/nova/instances/<image_id>
> ….
>     <disk type="file" device="disk">
>       <driver name="qemu" type="qcow2" cache="none"/>
>       <source file="/opt/stack/data/nova/instances/2f317b2e-f3b8-40cd-ba79-402231ccee51/disk"/>
>       <target bus="virtio" dev="vda"/>
>     </disk>
> ….
>  
> I want it to be
>       <target bus=”ide” dev=vda”/>
>  
> I could manually change libvirt.xml and  virsh edit <kvm_vm_name> as mentioned above. But I want to be able to do it either from Dashboard GUI or commands such as glance or nova.
>  
> Does anyone have any pointers on workarounds / solution on this?
>  
> Thanks
> Pattabi
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