Backup job fails with Creating VM snapshot Error: There are currently 2 usable fault domains. The operation requires 1 more usable fault domains when backing up from vSAN cluster
Backup job fails with Creating VM snapshot Error: There are currently 2 usable fault domains. The operation requires 1 more usable fault domains when backing up from vSAN cluster
Challenge
Backups fail as a result of a vSAN cluster node being offline.
Cause
If the vSAN has fewer than 4 nodes and one of the nodes is offline, either for schedule maintenance or unexpectedly, snapshots cannot be taken of VMs on the vSAN cluster.
Solution
VMware recommends having at least 4 nodes for extra fault tolerance in the event that a node would unexpectedly go down.
More information
This can occur with clusters of more than 3 nodes if enough nodes are offline to take the cluster down to 2 or fewer online nodes.