I believe it's two things.<br><br>Think of collocation as "with" or on top of.<br><br>So it should be resC on top of resB on top of DRBD:master. I think of collocation as being written in the reverse order of "order" statement. That's why resources in groups start in the order they are written and collocate in reverse from written order.<br><br>Second and this may or may not be right (travelling so I can't check right now). It could also be creating a resource group inside the collocation statement. This is because it will group like action types of resources if there are at least two different action types of resources AND at least two of one action type. <br>This would be causing the statement above to collocate resB on top of resC. From above... Groups collocate in reverse of the way they're written.<br>To check: crm configure show xml. This will output the actual order of the collocate statement which may be like what I wrote (first two reversed).<br><br>HTH<br><br>Jake<br><br><br>Sent from my HTC<br><br>----- Reply message -----<br>From: "Phil Frost" <phil@macprofessionals.com><br>To: <pacemaker@oss.clusterlabs.org><br>Subject: [Pacemaker] stopping resource stops others in colocation / order sets<br>Date: Thu, Jun 14, 2012 2:23 pm<br><br><br><br>