Steps

1. Configure the storage datastore type. Navigate to Storage > Virtual Storage and click New. Then, select the datastore type as Stretched datastore.

2. Select the node. Select the nodes to be added to the stretched datastore. The stretched cluster requires at least 4 nodes.

3. Specify fault domains. Add the required nodes to the corresponding fault domains. There are four nodes in this example, so two nodes are added to the Primary Fault Domain, while another two are added to the Secondary Fault Domain.

4. Add Witness Node: Configure the witness node IP according to the pre-installed witness node after naming the Primary Fault Domain and the Secondary Fault Domain. Follow the wizard to enter the password to confirm the configuration of the witness node.

After logging in to the witness node, you need to enable the SSH Port of the witness node under System > Port Management.

5. Confirm the configuration: Confirm the configuration of the fault domain. Modifying the fault domain where the node is located after the datastore is created is not supported.

6. Configure the Use of Disks. Next, you need to plan the use of disks, including data disk, cache disk, and spare disk. Generally, SSD is used as a cache disk to improve the IO performance of virtual storage. The system automatically recommends the type of hard disk according to the configuration. You can follow the default recommendations of the system.

7. Confirm the configuration. Finally, the page displays the configuration result information of the virtual datastore, including the final storage capacity, the number of copies, and the number of disks. After confirming that the configuration is correct, you need to enter the administrator password and click OK to start initializing the virtual datastore.