title: How to resize root partition online , on xfs filesystem?
body: <p>when I am trying to extend the root partition , using below method </p>
  
  <pre><code>[root@oel7 ~]# resize2fs /dev/root_vg/root
  resize2fs 1.42.9 (28-Dec-2013)
  resize2fs: Bad magic number in super-block while trying to open /dev/root_vg/root
  Couldn't find valid filesystem superblock.
  </code></pre>
  
  <p>I am unable to do the same with above last line error.</p>