[Pacemaker] Constraints with and without rules

Ben Beuchler insyte at gmail.com
Fri Aug 22 17:35:45 EDT 2008

I apologize for the cross-post if that's not kosher.  It appears
linux-ha still gets considerably more traffic than the pacemaker list.

Are these functionally equivalent on a cluster with symmetric-cluster=false?

This is the technique in the DRBD w/ v2 cluster document in the wiki
(albeit with a score of INFINITY instead of 100):

<rsc_location id="drbd0-loc-1" rsc="drbd0">
  <rule score="100">
    <expression value="node0" attribute="#uname" operation="eq"/>
    <expression value="node1" attribute="#uname" operation="eq"/>

And these are the type that seem to be favored in Mr. Beekhof's
excellent "Configuration Explained" document:

<rsc_location id="drbd0-loc-1" rsc="drbd0" node="node0" score="100"/>
<rsc_location id="drbd0-loc-2" rsc="drbd0" node="node1" score="100"/>

It seems both approaches should result in the same thing.  Any
particular reason to prefer one over the other?

FWIW, I'm running hb and pacemaker both from tip.



More information about the Pacemaker mailing list