Qcow2 Gns3 [hot] -
Use qemu-img check to verify the image before loading it into GNS3:
Select "Install the appliance on the GNS3 VM" (highly recommended for performance). Upload QCOW2: qcow2 gns3
stands for QEMU Copy On Write version 2 . It is a file format used by the QEMU processor emulator, which is the underlying engine that powers much of GNS3’s virtualization capabilities. Use qemu-img check to verify the image before