On 2008-09-09T11:18:59, David Teigland <[EMAIL PROTECTED]> wrote:
> > For some reason our cluster splits up into two rings.
> > Scenario is:
> > node1(n1) n2 n3 n4 n5 n6 are in the ring.
> >
> > Suddenly the ring splits into two rings:
> > n1 n2 n3 got leave msg from n4 n5 n6
> > n4 n5 n6 got leave msg from n1 n2 n3
> >
> > After a few milliseconds the two rings joins again:
> > n1 n2 n3 got join msg from n4 n5 n6
> > n4 n5 n6 got join msg from n1 n2 n3
> >
> > The two ring is joined to one ring again:
> > node1(n1) n2 n3 n4 n5 n6 are in the ring.
>
> We at RH have struggled a great deal with this exact "feature" for quite a
> long time. It's the biggest problem by far that we've had using openais.
Any insights as to why this occurs? Random membership fluctuations are
... a problem.
Pacemaker can, AFAIK, deal with the rings healing, but the splits are
worrying, as they might cause recovery action to occur.
Regards,
Lars
--
Teamlead Kernel, SuSE Labs, Research and Development
SUSE LINUX Products GmbH, GF: Markus Rex, HRB 16746 (AG Nürnberg)
"Experience is the name everyone gives to their mistakes." -- Oscar Wilde
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