[Linux-cluster] 2-node fencing question
teigland at redhat.com
Mon Jul 31 13:29:54 UTC 2006
On Mon, Jul 31, 2006 at 01:20:07PM +0000, danwest at comcast.net wrote:
> The out-of-band IPMI is basically a crossover cable to each others
> IPMI interface.
> A simple test of pulling the public interface one the node with an
> active resource results in each node being fenced. My understanding is
> that in the 2-node configuration the fencing is a race to see who can
> fence each other first. My concerns are the following:
> 1) If it is indeed a race it seems like both nodes successfully
> issue a /sbin/fence_ipmilan (ipmi_tool) resulting in both nodes being
Because of this race you should use a network power switch that forces the
two fencing operations to be serialized, then one will will.
> 2) Is there a way for this algorithm to determine which of the
> nodes was the one that had the problem? A simple race to fence could
> result in the faulty server winning.
No, that's another problem with the two node option. I think the new
quorum disk feature that's in the next release should address both of
> Also is there a way to configure fence_ipmilan in cluster.xml to reboot
> rather than stop the server? fence_ipmilan by itself takes the o
> option (on,off,reboot)
Someone else can probably answer that.
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