[Linux-cluster] CS4/ question about load on Heat Beat

[Alain Moulle]

>Hi
>> And thanks Patrick for this detailed answer.
>> Bu just a further question : what about the case of cluster
>> with only two nodes where the quorum mechanism can't be
>> applied : will we be in your second case description too(when
>> of the nodes can see any other node) ????


cman has a special "two_node" node which allows the cluster to continue with
only one vote. There is simply a race to see which node gets fenced first!


>> Or do both nodes will immediately try to fence one each other ?
>> Thanks


yes!

OK thanks Patrick.
So to conclude on this point:
the only way to avoid this problem in the case of
two-nodes cluster is to have a second Ethernet
network dedicated to the Heart-Beat of CS4
(so that this network should never be over-loaded),
isn't it ?
Or do you have any other suggestion ?

By the way, which is the value of timeout on Heart-beat
check ?
and how many times does it try to get the heart-beat
in case of timeout ?

Thanks again for your answers.

Alain Moullé

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