Hi Kris, The VirtIO drivers' injection is necessary to use high-performance devices like virtIO disks (virtio or virtio-SCSI) and virtio network interfaces. If planning to use emulated devices, these drivers are not necessary. In general, I do not import VMs to OpenStack. I prepare my specific OpenStack instances (Linux, Windows, and Solaris ) using a KVM host and installing virtio native drivers. For migration, you can install the VirtIO drivers before exporting VMs or use this injection process. Regarding importing a multi-disk instance into OpenStack, you may refer to glance documentation. But, as you are migrating a VM, I think this process will be an exception to importing disk by disk and adding it manually to your new OpenStack instance. Marcos From: KK CHN <kkchn.in(a)gmail.com&gt; Sent: quarta-feira, 25 de agosto de 2021 07:15 To: users <users(a)ovirt.org&gt; Subject: [External] : [ovirt-users] Injecting VirtIO drivers : Query Hi, I am in the process of importing multi disk Windows VMs from HyperV environment to my OpenStack Setup( Ussuri version, glance and QEMU-KVM ) I am referring online documents as in the trailing lines. But Is this relevant to inject VirtIO drivers to the Windows VMs ( as the articles date back to 2015) . Some where it mentions when you perform P2V migration its necessary. Is this VirtIO injection is necessary in my case ? I am exporting from HyperV and importing to OpenStack. 1. Kindly advise me the relevance of VirtIO injection and is it applicable to my requirements. 2. Is there any uptodate reference materials link for performing Windows Multidisk VM importing to OpenStack(ussurin, glance and KVM) . Or Am I doing an impossible thing by beat around the bush ? These are the links which I referred but it too old : So the relevance of the contents still applicable ? ( Windows VMs are Windows 2012 Server, 2008 and 2003 which I need to import to OpenStack) https://superuser.openstack.org/articles/how-to-migrate-from-vmware-and-h... https://portal.nutanix.com/page/documents/kbs/details?targetId=kA00e00000... Kris