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: qemu-img create -f qcow2 -o preallocation=metadata windows7.qcow2 40G

The cache setting in your hypervisor determines how data is written from the VM to the physical host storage. windows 7qcow2 best

: Drastically reduced latency and higher IOPS (Input/Output Operations Per Second). 2. Best Disk Cache Settings windows 7qcow2 best

To achieve the best results, you must focus on 1. Use VirtIO Drivers (The "Must-Have") windows 7qcow2 best