Hi all, I manage three 4.5 engines with 4.5 ovirt-nodes. When I update nodes (el8 based) from 4.5.4 to 4.5.5, vms can't migrate anymore. They only migrate from 4.5.4 el8 to 4.5.4 el8 hosts, 4.5.5 el8 to 4.5.5 el8 hosts. But: They can migrate from 4.5.4(el8) to 4.5.5(el9) It may come from qemu-kvm incompatibility versions: 4.5.5 el9: qemu-kvm-8.1.0-4 4.5.4 el8: qemu-kvm-6.2.0-41 4.5.5 el8: qemu-kvm-6.2.0-20 This makes the migration impossible without a downtime. The solution could be to resintall each host in 4.5.5 el9 based, but the most of my production vms run with a qxl/spice graphic based which are not supported anymore on el9. Does anybody know how to do this migration without any downtime? Thank you. -- Nathanaël Blanchet Administrateur Systèmes et Réseaux Service Informatique et REseau (SIRE) Département des systèmes d'information 227 avenue Professeur-Jean-Louis-Viala 34193 MONTPELLIER CEDEX 5        Tél. 33 (0)4 67 54 84 55 Fax  33 (0)4 67 54 84 14 blanchet@abes.fr