Starting virtual machines fails with an error like:
LibVirt: Call to virDomainCreateXML failed: internal error process exited while connecting to monitor: qemu-kvm: -drive file=/dev/fd9pus6wo1y5xh/yaj97wnte4c80m,if=none,id=drive-virtio-disk0,format=raw,cache=none: could not open disk image /dev/fd9pus6wo1y5xh/yaj97wnte4c80m: Operation not supported
KVM HVs with Supermicro motherboard
Update BIOS to the latest version.
The HV had this motherboard: http://www.supermicro.com/products/motherboard/Xeon/C600/X9DRT-HF.cfm
This was fixed by upgrading the BIOS
BIOS File Name: X9DRTH3_628.zip