What a node in the cluster is

A node is a controller in a cluster. It is connected to other nodes in the cluster over a private management cluster network. It is also connected to the disk shelves that provide physical storage for the Data ONTAP system or to third-party storage arrays that provide array LUNs for Data ONTAP use.

A node Storage Virtual Machine (SVM) represents a node in the cluster. The cluster setup process automatically creates a node SVM for each node in the cluster.