Which Quorum Models are Available in Windows 2008 or higher?
Windows 2008 and higher offers these Quorum Models. The Quorum models are discussed in detail here. • Node Majority quorum mode – this model requires an odd number of nodes. Uncommon for SAP systems • Node and Disk Majority quorum mode – this is a combination of Node and Quorum disk. This Quorum Model can be used for clusters where the nodes are all in the one data center • Node and File Share Majority quorum mode – Common for SAP systems and can also be used for Geographically Dispersed Clusters • No Majority: Disk Only quorum mode – Traditional Windows 2003 Quorum Disk Model. Recommend to discontinue use of this Model In addition to the above there are configurations using Node Majority where the cluster is stretched across two datacenters. These “stretch clusters” are called Geoclusters. Please contact Microsoft if you are planning to implement a Geocluster for SAP. Also please note that although Windows 2008 supports cluster nodes on different IP Subnets, SAP does not. Therefore it
