Data nodes are the additional cluster nodes that allow you to scale out vRealize Operations Manager to monitor larger environments.

A data node always shares the load of performing vRealize Operations Manager analysis and might also have a solution adapter installed to perform collection and data storage from the environment. You must have a master node before you add data nodes.

You can dynamically scale out vRealize Operations Manager by adding data nodes without stopping the vRealize Operations Manager cluster. When you scale out the cluster by 25% or more, you should restart the cluster to allow vRealize Operations Manager 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 vRealize Operations Manager cluster.

In addition, the product administration options include an option to rebalance the cluster, which can be done without restarting. Rebalancing adjusts the vRealize Operations Manager workload across the cluster nodes.