<os> <boot dev='hd'/> </os> Cause : The qcow2 file resides on a storage pool with CoW enabled on the host filesystem (e.g., Btrfs or ZFS without tuning). Fix : Disable copy-on-write on the host directory for the qcow2 file:
sha256sum panorama-kvm-10.0.4.qcow2 Move the file to the default KVM storage pool: panorama-kvm-10.0.4.qcow2
virsh snapshot-create-as panorama-10-0-4 pre-upgrade \ --disk-only --atomic --quiesce This creates a new qcow2 overlay file while preserving the original panorama-kvm-10.0.4.qcow2 as a read-only backing file. If the upgrade fails, you can revert in seconds. Need a test instance? Use qemu-img to create a linked clone: Need a test instance
chattr +C /var/lib/libvirt/images/ Cause : Version 10.0.4 requires sufficient entropy for SSL generation. KVM guests often lack hardware RNG. Fix : Add a VirtIO RNG device to the VM XML: Fix : Add a VirtIO RNG device to the VM XML: