[Linux-cluster] how do I reduce the risk of split-brain while performing node maintenance

Martin Waite Martin.Waite at datacash.com
Mon Jan 25 09:49:29 UTC 2010


Suppose that I have a cluster with an odd-number of nodes - say 3 nodes.
In the event of a network partition, split brain is avoided by moving
(or keeping) leadership to the partition that contains two nodes. 

In the event of routine maintenance, where one of the members needs to
be brought down in order to be replaced or upgraded, I now have a 2-node
system which presumably is at risk of split brain in the event of a
network partition happening during the maintenance window.

What is the best way of reducing the risk of split brain during the
maintenance window when the cluster is not at full strength ?



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