Virtual disks should never be defragmented by the guest OS. Disable the scheduled disk defragmenter task entirely.
Matching your storage system structures minimizes structural processing overhead during deep read/write operations: Windows 7 KVM guests - Proxmox Support Forum
The qcow2 (QEMU Copy-On-Write) format is a versatile and efficient virtual disk image format used by QEMU and other virtualization platforms. When running Windows 7 on a qcow2 virtual disk, it's essential to follow best practices to ensure optimal performance, stability, and data integrity. In this write-up, we'll cover the most effective ways to optimize Windows 7 on qcow2.
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To achieve optimal disk and network I/O performance, you use VirtIO drivers instead of the emulated IDE or SATA controllers. Since Windows 7 does not include these drivers by default, you need to provide them during the initial installation.
: The default 64KB cluster size is standard, but some users adjust this during image creation to better match their specific storage backend. Helpful Technical Resources