How Do You See the Storage Usage on a Datanode in an hdfs System?

Problem scenario
You want to see which datanodes are active underlying a given hdfs system.  You also want to know statistics about the storage usage.  If you are regularly adding data to your hdfs system, you want to stay below 70% utilization.  If you want your hdfs system to perform well but you are not regularly adding new files, you want to stay under 80%.  How do you find out about the storage usage of your datanodes that support your hdfs system?

Solution
Run this command:

hdfs dfsadmin -report
# or this command below
sudo /usr/local/hadoop/bin/hdfs dfsadmin -report

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