There is a maximum of 1 Witness host per vSAN Stretched Cluster. The Witness host requirements are discussed in the Design Considerations section of this guide. VMware provides a fully supported vSAN Witness Appliance, in Open Virtual Appliance (OVA) format. This is for customers who do not wish to dedicate a physical ESXi host as the witness. This OVA is essentially a pre-licensed ESXi host running in a virtual machine and can be deployed on a physical ESXi host at the third site.
Essential Virtual SAN VSAN Administrators Guide To VMware Virtual SAN 2nd Edition VMware Pres
Adding Witness NodeWitness node can be configured on a separate host or as a virtual machine in a cloud. It requires StarWind Virtual SAN service installed on it.NOTE: Since the device created in this guide is replicated between 2 active nodes with the Node Majority failover strategy, a Witness node must be added to it.1. Open StarWind Management Console, right-click on the Servers field and press the Add Server button. Add a new StarWind Server which will be used as the Witness node and click OK.2. Right-click on the HA device with the configured Node Majority failover policy and select Replication Manager and press the Add Replica button.3. Select Witness Node.4. Specify the Witness node Host Name or IP address. The default Port Number is 3261.5. In Partner Device Setup, specify the Witness device Location. Optionally, modify the target name by clicking the appropriate button.6. In Network Options for Replication, select the synchronization channel with the Witness node by clicking the Change Network Settings button.7. Specify the interface for Synchronization and Heartbeat and click OK.8. Click Create Replica and then close the wizard.9. Repeat the steps above to create other virtual disks if necessary.
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