You can deploy and configure additional nodes so that VMware Aria Operations can support larger environments. A primary node always requires an additional node for a cluster to monitor your environment. With expanding your installation, you can add more than one node to your cluster.
Adding Data Nodes
Data nodes are the additional cluster nodes that allow you to scale out VMware Aria Operations to monitor larger environments.
You can dynamically scale out VMware Aria Operations by adding data nodes without stopping the VMware Aria Operations cluster. When you scale out the cluster by 25% or more, you should restart the cluster to allow VMware Aria Operations to update its storage size, and you might notice a decrease in performance until you restart. A maintenance interval provides a good opportunity to restart the VMware Aria Operations cluster.