to install all remaining drivers for networking and performance. OpenNebula 5. Optimization & Image Prep (Optional) How to create Windows VM? - OpenNebula Forum

The system is looking for an IDE/SCSI controller, but the disk was configured as VirtIO without loading the drivers first.

Latest driver package (stable release recommended). Step 1: Create the Blank QCOW2 Virtual Disk

: To ensure high performance and proper disk recognition during installation, download the Windows VirtIO Drivers ISO

Missing VirtIO drivers; Windows is using an emulated IDE driver. Solution: Attach the VirtIO ISO, update the disk driver from "Standard SATA AHCI" to "VirtIO SCSI," and reboot.

Ensure your QCOW2 cluster sizes map exactly to the hypervisor page frames. The default QCOW2 cluster size is . If you are formatting the virtual disk partitions inside Windows 10, selecting a 64 KB allocation unit size (cluster size) for the NTFS filesystem matches storage boundaries perfectly, eliminating write amplification caused by misaligned sector modifications. 5. Managing the Storage Lifecycle

Why 80G? Windows 10 needs at least 64 GB for comfort (updates require significant space). The -f qcow2 flag specifies the format.

qemu-img convert is too slow. Fix: Add -W (write caching) and use -p to show progress: qemu-img convert -p -W -f qcow2 -O raw ...

Windows 10 tends to mark space as "free but not zeroed." To shrink the file after deleting files inside the guest:

Several providers offer pre-configured Windows 10 QCOW2 images, including virtio drivers (essential for performance).

Ensure all devices (Network, SCSI controller) are using VirtIO in Device Manager. 2. Prepare for Generalization (Optional)

Convert a raw or VMDK image to QCOW2:

It supports multiple virtual machine states, allowing easy rollbacks if an update breaks the system.

Select the folder corresponding to your architecture (e.g., viostor/w10/amd64 ).