Select the unallocated space and proceed with the normal Windows installation. Post-Installation Configurations
A raw img file for Windows 10 would immediately consume 30-60 GB of disk space. A qcow2 file starts small (usually 1-2 GB) and grows dynamically as Windows writes data. For example, a fresh Windows 10 installation might report 20 GB used inside the guest, but the host file may only be 12 GB due to compression and sparse allocation.
Standard Windows drivers will lead to poor performance in KVM/QEMU. You must download the VirtIO Windows Driver ISO Fedora VirtIO project 3. Installation Best Practices When setting up the VM in virt-manager windows 10qcow2
An output showing kvm_intel or kvm_amd confirms KVM support is enabled.
You can create a "base" Windows 10 QCOW2 image and spawn multiple "linked clones" from it, saving massive amounts of disk space. Prerequisites Select the unallocated space and proceed with the
Running Windows 10 on qcow2 can be nearly bare-metal fast with proper tuning.
qemu-img create -f qcow2 -b windows10_base.qcow2 -F qcow2 windows10_overlay1.qcow2 For example, a fresh Windows 10 installation might
If you are setting this up for a specific environment, let me know your or target infrastructure (like Proxmox , OpenStack , or standard KVM ). I can provide customized optimization flags or commands tailored exactly to your environment. Share public link
Ensure that the discard option is enabled in the disk configuration and that you run a scheduled optimization trim inside the Windows 10 defragmentation app. Final Thoughts
The qemu-img tool is your command center for managing your qcow2 images.
Configure RAM (minimum 4096 MB) and CPU cores (minimum 2 or 4).