title: How to detect RAID on Linux?
body: <p>I have the Linux server Ubuntu 11.10, and previous administrator assure me, that the RAID 1 (software) is used on the system. However, when I do <code>fdisk -l</code> one of the (two) disks even does not have partition table. </p>
  
  <pre><code> cat /proc/mdstat
  
         Personalities :
         unused devices: &lt;none&gt;
  </code></pre>
  
  <p>I believe that RAID are NOT configured and second disk do nothing.
  How do I know for sure that I'm right?</p>