When any capacity device in your cluster reaches 80 percent utilization, Virtual SAN automatically rebalances the cluster, until the utilization of all capacity devices is below the threshold.
Cluster rebalancing evenly distributes resources across the cluster to maintain consistent performance and availability.
- If Virtual SAN detects hardware failures on the cluster
- If Virtual SAN hosts are placed in maintenance mode with the Evacuate all data option
- If Virtual SAN hosts are placed in maintenance mode with Ensure data accessibility when objects assigned PFTT=0 reside on the host.
You can manually rebalance the Virtual SAN cluster by using the Ruby vSphere Console (RVC). See Manual Rebalance.