[Linux-cluster] CS5 / quorum disk and heuristics

Alain Moulle Alain.Moulle at bull.net
Mon Jun 9 12:23:13 UTC 2008


One thing bothers me again :

I have this record in cluster.conf :
<quorumd label="QDISK_0_0" interval="1" tko="10" votes="1" min_score="1">
  <heuristic interval="10" tko="3" program="ping -t1 -c1" score="1"/>
  <heuristic interval="10" program="ping -t3 -c1" score="1"/>
where is a third machine not in my cluster pair node1/node2

My last understanding was that quorum disk was NOT a redundancy of heart-beat,
meaning that if heart-beat interface fails, there is a failover but it is
always the node with the expected min_score in quorum disk which fence the
So I thought that the quorum disk check was operationnal only if the node
detects a problem on heart-beat interface ... but when I set down the interface
on the third machine, and after a few seconds, both nodes node1/node2
are killed !!! Whereas heart-beat interface was working fine.
And after reboot, I can see "cluster not quorate" etc.

So in fact, even if the heart-beat interface works fine, but there is
not the expected min_score for heuristics of quorum disk, both nodes
are stopped.

Is it the normal behavior ?

Alain Moullé

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