Failover Clustering lets multiple Windows Servers work together so that if one node fails, another automatically takes over a workload — essential for services that genuinely can’t tolerate downtime.
# Install the clustering feature on each node Install-WindowsFeature -Name Failover-Clustering -IncludeManagementTools # Validate the nodes are cluster-ready BEFORE creating the cluster Test-Cluster -Node "Node1", "Node2" # Create the cluster New-Cluster -Name "MyCluster" -Node "Node1", "Node2" -StaticAddress "10.0.0.100" # Check cluster and resource status Get-ClusterNode Get-ClusterResource
Quorum: Why You Need an Odd Number (or a Witness)
A cluster needs a majority (“quorum”) of votes to stay online and avoid a split-brain scenario where two halves of a partitioned cluster both think they’re in charge. With an even number of nodes, a File Share Witness or Cloud Witness provides the tie-breaking vote — skipping this is the most common reason a two-node cluster behaves unpredictably during a network partition.