The shared storage mode or IBM Storage Scale System

Among these nodes, you need to define at least one NameNode and one DataNode. If NameNode HA is configured, you need at least two nodes for NameNode HA and one DataNode.

In production, you need at least two DataNodes to tolerate one DataNode failure if your file system takes data replica 1. If your file system takes data replica 2 (for example, IBM Storage Scale over shared storage), you need at least three DataNodes to tolerate one DataNode failure.

After HDFS transparency nodes are selected, see Installing and Configuring to configure HDFS Transparency on these nodes.