[Pacemaker] resource moving unnecessarily due to ping race condition

Brad Johnson bjohnson at ecessa.com
Thu Sep 8 15:24:04 EDT 2011

OK, attached is the full cibadmin -Q output.


On 09/08/2011 02:07 PM, Florian Haas wrote:
> On 09/08/11 20:59, Brad Johnson wrote:
>> We have a 2 node cluster with a single resource. The resource must run
>> on only a single node at one time. Using the pacemaker:ocf:ping RA we
>> are pinging a WAN gateway and a LAN host on each node so the resource
>> runs on the node with the greatest connectivity. The problem is when a
>> ping host goes down (so both nodes lose connectivity to it), the
>> resource moves to the other node due to timing differences in how fast
>> they update the score attribute. The dampening value has no effect,
>> since it delays both nodes by the same amount. These unnecessary
>> fail-overs aren't acceptable since they are disruptive to the network
>> for no reason.
>> Is there a way to dampen the ping update by different amounts on the
>> active and passive nodes? Or some other way to configure the cluster to
>> try to keep the resource where it is during these tie score scenarios?
>> We are running Pacemaker 1.0.10 with Heartbeat 3.0.5. Here are our
>> current resource and constraints sections:
> Just those two aren't enormously helpful; as the current state of your
> node attributes isn't evident from them.
> If you could just dump your full CIB and upload them to
> pastebin/pastie/fpaste etc., it would be easier to make recommendations.
> Cheers,
> Florian
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