are you asking about balancing HDFS so that all nodes are evenly distributed? In that case you need to run HDFS balancer and it will spread that node's data across nodes, otherwise it defeats the point of balancing out HDFS. You can use -include -f hostsfile to hint which nodes to run balancer against but idea is you need more than one node there, is meant to be across multiple datanodes not single datanode.

https://hadoop.apache.org/docs/r2.7.3/hadoop-project-dist/hadoop-hdfs/HDFSCommands.html#balancer

If your question is to balance data across all disks on one node, you can use disk balancer, sadly it's a new feature in Hadoop 3. https://hadoop.apache.org/docs/current/hadoop-project-dist/hadoop-hdfs/HDFSDiskbalancer.html