[Linux-cluster] fencing loop in a 2-node partitioned cluster
Kein He
kein.he at gmail.com
Tue Feb 24 08:05:01 UTC 2009
Hi Rajeev,
there are several ways to stop the fencing loop:
1. import the third node to the cluster, as a result the quorum votes
will great than half total votes .
2. Using qdisk, you can implement the Tie-Breaker IP: use heuristic
option to monitor the Gateway. qdisk will also increase the cluster
votes, makes the total votes an odd number.
Regards,
Kein
Rajeev P wrote:
> Hi,
>
> I have question regarding a network partition in a 2 node cluster.
>
> Consider a 2-node cluster (node1 and node2) setup with a cross-cable
> for heartbeat and setup to use HP iLO as the fencing mechanism. In the
> event of network partition (and this case assume that the cross cable
> was pulled out) one of the node's succeed in fencing the other. The
> question is, when the fenced node on rebooting would it attempt fence
> the existing node if it can't communicate with it (since the heartbeat
> network is still down).
>
> For example consider that in the event of n/w partition, node1 fences
> node2. Would node2 on rebooting (can't communicate with node1) would
> attempt to fence node1 and form a 1-node cluster.
>
> If yes, can this infinite fencing loop be prevented in 2-node with the
> use of a qdisk which denies quorum to node rebooting? Appreciate any
> suggestions to prevent this loop.
>
> Regards,
> Rajeev
>
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