I have built an openstack(icehouse) platform with three virtual machines; controller, compute and network nodes. I aim to use qemu instead of kvm for virtualization. So I have inserted the following lines into /etc/nova/nova.conf in compute node: [default] compute_driver=libvirt.LibvirtDriver [libvirt] virt_type=qemu But if an instance is tried to be created, it immediately gets into error state: Error: internal error: no supported architecture for os type 'hvm' After some research, I have found the golden information: Qemu hypervisor only supports RAW, QCOW2, VMDK virtual disk formats. Mine is VDI. I have converted the disk image into VMDK format. qemu-img convert input.vdi -O vmdk output.vmdk After running compute-vm on vmdk image, I become able to create an instance without any error.
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