I/O Fencing performs identically on node failures and communications failures. When Microsoft Failover Clustering on a node becomes aware of a change in cluster membership, it immediately begins the arbitration process. Depending on the outcome of the arbitration process, the winning node ejects the departed nodes from the data disks. In a split-brain scenario, both sides of the split would race for proving majority. The side that is able to prove the majority, wins the race and fences the losing side.