title: gluster peer probe failed: <node> is either already part of another cluster or having volumes configured
body: <p>I have 2 gluster clusters of type distributed-replicated:</p>
  
  <p>Cluster 1 (C1): with bricks in machines M1 and M2.</p>
  
  <p>Cluster 2 (C2): with bricks in machines M3 and M4.</p>
  
  <p>I want to expand C1 by adding M4 (already part of C2) and another machine M5.</p>
  
  <p>For adding the bricks, first I need to add M4 and M5 into C1 by probing M4 and M5 from either M1 or M2. When I do peer probe, I am able to add machine M5, but when I try to add M4 to C1 by </p>
  
  <p><code>sudo gluster peer probe M4</code></p>
  
  <p>I get:</p>
  
  <p><em>peer probe: failed: M4 is either already part of another cluster or having volumes configured</em></p>
  
  <p>I have two questions:</p>
  
  <ol>
  <li><p>Is it even possible to achieve what I want (since I am mixing two different clusters)?</p></li>
  <li><p>If yes, how to do it?</p></li>
  </ol>
  
  <p>PS: I have read the following links but my issue still is not resolved:
  <a href="https://bugzilla.redhat.com/show_bug.cgi?id=1010153" rel="nofollow noreferrer">redhat mailing list</a>, <a href="https://bugzilla.redhat.com/show_bug.cgi?id=1287951" rel="nofollow noreferrer">redhat mailing list-2</a></p>