title: Size of HDFS database does not make sense
body: <p>I am given these usage statistics on my HDFS folder allocated to my project.</p>
  <pre><code>hdfs dfs -df -h hdfs://hp3/data/test_data.db
  
  Filesystem   Size   Used  Available  Use%
  hdfs://hp3  6.1 P  5.1 P      1.0 P   83%
  </code></pre>
  <p>What does the 'P' stand for? It cannot be petabytes because I know the data I have uploaded and it is ~ 10 GB.</p>