I removed the 2x40QSFP+ NIC and replaced it with a Supermicro AOC-S25G-m2S 2x25gbit/sfp28 and added an Intel i210-T1 1x1gbit for Corosync. So per node i now have 2x25gbit/sfp28 (DAC, cluster), 2x10gbit/rj45 (public), 1x1gbit/rj45 (corosync).
After checking PVE documentation (thanks for the...