[Pacemaker] Split-brain after

Alex Forster alex at alexforster.com
Thu Aug 11 12:58:55 EDT 2011

I have a two node Pacemaker/Corosync cluster with no resources configured yet.
I'm running RHEL 6.1 with the official 1.1.5-5.el6 package.

While doing various network configuration, I happened to notice that if I issue
a "service network restart" on one node, then approx. four seconds later issue
"service network restart" on the second node, the two nodes become split brain,
each thinking the other is offline.

Obviously, issuing 'service network restarts' four seconds apart will not be a
common occurrence in production, but it concerns me that I can 'trick' the nodes
into becoming split-brain so easily. Is there some way I can configure Corosync
to quickly recover from this scenario?


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