[Linux-cluster] avoiding 2 Node Fencing shootout

[Robert Peterson]

Chris Harms wrote:
> Hi all,
> 
> Setup:
> 
> Cluster Suite 5
> 2 Nodes each fenced by DRAC card over network interface. Flagged as two 
> node in cluster.conf
> 
> <cman expected_votes="1" two_node="1"/>
> 
> As a test, I unplugged one node (Node A) from the network.  The 
> remaining node (Node B) attempted to fence it, but failed (no network 
> access) and never assumed the services.  Plugging in Node A a gain 
> induced each to fence the other.  Something similar happens when a node 
> is rebooted manually (shutdown -r now).
> 
> How does one best combat this?  I've seen reference to adding a ping 
> node but no actual documentation on how to do it.
> 
> Thanks,
> Chris
> 
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> Linux-cluster at redhat.com
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> 
Hi Chris,

Here's a good place to start:

http://sources.redhat.com/cluster/faq.html#quorum

There's a couple FAQ entries after that one too pertaining to tie-breaking.

Regards,

Bob Peterson
Red Hat Cluster Suite