To achieve "best-in-class" performance for Windows 7 on QCOW2, several configurations are critical: VirtIO Drivers:
fsutil behavior set DisableDeleteNotify 0 windows 7qcow2 best
: Use virtio-blk or virtio-scsi + qcow2 + cache=unsafe (only for non-critical test VMs) for max throughput. To achieve "best-in-class" performance for Windows 7 on
Once Windows 7 is installed, you need to optimize it for virtualization. windows 7qcow2 best
: qemu-img create -f qcow2 -o preallocation=metadata windows7.qcow2 40G
Windows 7 does not auto-detect thin-provisioned storage. Manual configuration required:
For Windows 7 specifically, QCOW2 overcomes the OS’s lack of modern storage drivers (like NVMe) when configured correctly.