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Re: [Linux-cluster] How to disable node?



Marc - A. Dahlhaus schrieb:
Jakov Sosic schrieb:
On Mon, 31 Aug 2009 15:30:13 -0500
Alan A <alan zg 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.

Marc




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