10qcow2 | Windows

| Issue | Solution | | :--- | :--- | | | Convert to raw temporarily, update, then convert back. Or increase cluster size. | | High CPU on I/O | Use aio=native and cache=none for servers. | | Corruption on host crash | Enable cache=unsafe only for disposable VMs. Use cache=writeback + UPS. | | Cannot resize Windows system partition easily | Use qemu-img resize + extend partition inside Windows Disk Management. |

qemu-system-x86_64 -m 4G -enable-kvm -cpu host -smp 4 \ -drive file=win10.qcow2,if=virtio \ -cdrom /path/to/windows10.iso \ -drive file=/path/to/virtio-win.iso,index=3,media=cdrom \ -vga qxl -device usb-tablet Use code with caution. Copied to clipboard windows 10qcow2

Would you like a full draft with benchmarks, command examples, and libvirt XML snippets? | Issue | Solution | | :--- |

Windows 10 tends to mark space as "free but not zeroed." To shrink the file after deleting files inside the guest: | | Corruption on host crash | Enable

qemu-img resize windows10.qcow2 +20G