[Linux-cluster] How to disable node?

Marc - A. Dahlhaus mad at wol.de
Mon Aug 31 21:43:54 UTC 2009

Marc - A. Dahlhaus schrieb:
> Jakov Sosic schrieb:
>> On Mon, 31 Aug 2009 15:30:13 -0500
>> Alan A <alan.zg at gmail.com> wrote:
>>> You have to give your cluster 2 node setting on remaining two nodes.
>>> How can I define a two-node cluster if a majority is needed to reach
>>> quorum?
>>> We had to allow two-node clusters, so we made a special exception to
>>> the quorum rules. There is a special setting "two_node" in
>>> the /etc/cluster.conf file that looks like this:
>>> <cman expected_votes="1" two_node="1"/>
>>> This will allow one node to be considered enough to establish a
>>> quorum. Note that if you configure a quorum disk/partition, you don't
>>> want two_node="1".
>>> http://sources.redhat.com/cluster/wiki/FAQ/CMAN#two_node
>> Yeah I know how to set up two_node cluster, but didn't know that
>> reconfiguration is the only way out when one node is missing :( I'm
>> disappointed with this limitation, I hope that developers will sort it
>> out for RHEL6 :(
> I think your so called 'limitation' is more related to mistakes that was 
> made during the planing phase of your cluster setup than to missing 
> functionality.
> Please take a look at the qdisk manpage and aditionaly to the cman faq 
> sections about tiebraker, qdisks and especially the last man standing 
> setup...

I forgot to mention that if you can't add a qdisk to your setup, you 
could still try to bring your cluster into running state by starting 
fenced in clean start without fencing mode (read fenced manpage for the 
details). Your quorum is reached at a score of two so you can start it 
that way.


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