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It's happening again, but I've only updated a few nodes. I have one more problematic problem. When the udp flood problem appeared, I also had a connectivity problem on another network. Corosync runs on a dedicated 1G network and I have a second 10G network for communicating between virtual...

Ok, I will try with pve-cluster 6.2-1 I have 20 nodes in local cluster, single location and low latencies.

$ # pveversion -v proxmox-ve: 6.2-2 (running kernel: 5.4.60-1-pve) pve-manager: 6.2-11 (running version: 6.2-11/22fb4983) pve-kernel-5.4: 6.2-6 pve-kernel-helper: 6.2-6 pve-kernel-5.4.60-1-pve: 5.4.60-2 ceph-fuse: 12.2.11+dfsg1-2.1+b1 corosync: 3.0.4-pve1 criu: 3.11-3 glusterfs-client: 5.5-3...

Hi i have very similar situation, cluster is about 20 nodes and there is a big problem with usp corosync flood (sometimes one per month but sometimes daily). I try to avoid cluster spliting. Should I switch to sctp? Is it safe if this isn't default configuration? @spirit wrote about bugfix...