title: OS Storage not release after move data file in Oracle 12c
body: <p>Today I try to move oracle data file online as we know that is a capability from Oracle 12c. But after Im moving some data file, why my mount point still give me 100% of usage?</p>
  
  <pre><code>[oracle@DB myserver]$ df -h /oracle/oradata1/
  Filesystem                           Size  Used Avail Use% Mounted on
  /dev/mapper/vg_oradata1-lv_oradata1  296G  281G   21M 100% /oracle/oradata1
  [oracle@DB myserver]$
  [oracle@DB myserver]$ du -sh /oracle/oradata1/
  151G    /oracle/oradata1/
  </code></pre>
  
  <p>it supposed to be I have more than 100GB free space in my /oradata1</p>
  
  <p>I also check the data file in the old mount point oradata1 already moved to oradata2. But why my OS(rhel 6.5) Storage not releasing the size?</p>
  
  <p>Can someone give me some clue for this?</p>
  
  <p>thanks in advance</p>