To ensure that the virtual machine objects continue to run smoothly during a rack failure, you can group hosts in different fault domains.
When you provision a virtual machine on the cluster with fault domains, Virtual SAN distributes protection components, such as witnesses and replicas of the virtual machine objects across different fault domains. As a result, the Virtual SAN environment becomes capable of tolerating entire rack failures in addition to a single host, storage disk, or network failure.
- Choose a unique fault domain name. Virtual SAN does not support duplicate fault domain names in a cluster.
- Verify the version of your ESXi hosts. You can only include hosts that are 6.0 or later in fault domains.
- Verify that your Virtual SAN hosts are online. You cannot assign hosts to a fault domain that is offline or unavailable due to hardware configuration issue.
- Navigate to the Virtual SAN cluster in the vSphere Web Client.
- Click the Configure tab.
- Under vSAN, click Fault Domains and Stretched Cluster.
- Click the Create a new fault domain icon ().
- Type the fault domain name.
- From the Show drop-down menu, select Hosts not in fault domain to view the list of hosts that are not assigned to a fault domain or select Show All Hosts to view all hosts in the cluster.
- Select one or more hosts to add to the fault domain.
A fault domain cannot be empty. You must select at least one host to include in the fault domain.
- Click OK.
The selected hosts appear in the fault domain.