This error occurs when the wrong VM image is used. For example, FFW_VM64_KVM (FortiFirewall) is incompatible with FGT_VM64_KVM (FortiGate). Verify the product code in the filename before deployment.
: Denotes FortiOS version 7.2.3, where "F" stands for a Feature release (introducing new capabilities rather than strictly patch updates). fgtvm64kvmv723fbuild1262fortinetoutkvmqcow2 exclusive
Edit the VM's XML definition file ( virsh edit [vm-name] ), find the disk device section, and set both driver parameters: <driver name='qemu' type='qcow2' cache='none' aio='native'/> . This disables double caching and enables native asynchronous I/O. This error occurs when the wrong VM image is used
From internal discussions in KVM-focused security forums, here are known quirks for build 1262: : Denotes FortiOS version 7
Execute the provisioning script to define the vCPUs, memory, disk attachments, and network interfaces. Ensure you select virtio for maximum network throughput:
Some managed security service providers (MSSPs) receive custom builds with pre-configured defaults, restricted feature flags, or performance optimizations for their proprietary KVM-based platforms.