Why Bother I have a two-node Proxmox VE cluster, and two-node clusters have an inherent distributed systems problem: if either machine goes down, the surviving node can't tell whether it should keep running or not. Running a quorum usually requires a majority vote, which normally means at least three voters. With only two machines, one vote each, lose one and you're down to one vote. No quorum and your cluster stops. The solution is a quorum device. Proxmox supports corosync-qnetd , a lightweight daemon from the corosync project that acts as a third-party tiebreaker. A qnetd doesn't participate in storage or compute, it just casts the deciding vote during a split-brain scenario. By bringing the total vote count to three, the cluster maintains a majority requirement and consequently, if any node fails, the surviving node and the router’s vote can collectively sustain quorum, making the cluster keeps running.…