The keyword "best" implies speed. Here’s how to tune your QCOW2 image for near-native performance:
: The QCOW2 format works excellently with Windows 7 – the OS itself is the real problem today. windows 7qcow2 best
: Windows 7 does not natively support the VirtIO disk controller. You must load these drivers during installation to achieve significantly faster disk I/O. The keyword "best" implies speed
: Larger cluster sizes (e.g., 128KB or 256KB) can improve sequential performance, though the default 64KB is generally sufficient for standard use. Lazy Refcounts lazy_refcounts=on to reduce metadata updates. Server Fault Recommended Command: windows 7qcow2 best
Each data cluster can be independently compressed to further save host storage. Best Settings for Performance