I did not try to reproduce the issue after it worked. As far as I remember:
1. I changed the bond0 policy from Active Backup to XOR (profile name: bond0, device:
bond0) with eno1 and eno5 (ovirtmgmt).
2. I changed the bond1 policy from Round-Robin to XOR (profile name: bond1, device: bond1)
with eno2, eno3, eno6 and eno7 (iSCSI).