The quorum is the most important yet overly complex and confusing component in a Windows Server Failover Cluster (WSFC.) Understanding its function and behavior can help properly design and configure a highly available WSFC environment that can be used for any type of supported workload.
We will look at the quorum behaviour between the different versions of the Windows Server operating system, considerations between using a disk witness and a file share witness as well as dealing with single- or multi-data center deployments.