[Pacemaker] [pacemaker] Quorum in even numbered Cluster

Michael Schwartzkopff misch at clusterbau.com
Thu May 26 18:10:27 UTC 2011


> Hi,
> 
> please explain me, how a pacemaker cluster, with an even number of nodes,
> selects quorum when the cluster splits into two evenly parts. For example
> a four-node-cluster breaks into two partitions each with two nodes.
> 
> Best regards,
> Roman

Quorum says that the should be *more* than half of the original nodes. If a 
even numbered cluster splits into two halfs none of the nodes has quorum. 
Quorum will never work in a two-node cluster.

Same applies to even-numbered clusters distributed even over two computer 
centers.

Greetings,

-- 
Dr. Michael Schwartzkopff
Guardinistr. 63
81375 München

Tel: (0163) 172 50 98
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