Proxmox HA Cluster: Avoiding Split-Brain and Configuring Quorum Correctly
Proxmox HA-Cluster: Split-Brain verhindern und Quorum richtig konfigurieren Wer mit Proxmox VE arbeitet, weiß: Ein HA-Cluster ist die Krönung der Virtualisierungsinfrastruktur. Doch was tun, wenn plötzlich zwei Cluster-Mitglieder denken, sie seien der alleinige Herrscher über die VMs? Das nennt man Split-Brain – und es ist das Worst-Case-Szenario in jedem Hochverfügbarkeits-Setup. In diesem…
The article discusses how to prevent Split-Brain and configure Quorum correctly in a Proxmox HA-Cluster. Split-Brain occurs when cluster nodes lose communication and think they are the only remaining node, leading to data inconsistencies. A solid Quorum mechanism can prevent this, and it requires a majority decision in the cluster, for example, at least 2 nodes online in a 3-node cluster.
The article provides configuration examples, including setting the expected number of nodes with "pvecm expected 2" and using a Witness server to stabilize the Quorum. It also highlights common mistakes to avoid, such as underestimating network latency and incorrect Quorum settings.
Written by urgent.news from Dev.to's report — not a translation of it. Machine-written — may contain errors; check the original before relying on it.
