[Pacemaker] spilit brain situation

[Romi Verma]

Thanks Dominic,
i have two questions now.

1) what does no-quorum-policy= suicide means then??  does it remove the
resource completely.

2) why each node is thinking itsef as DC as Andrew said after spilit brain
election happens and one node is selected as DC. This is not happening in my
case.
i dont have any stonith configured in my cluster . do i need stonith to
handle spilit brain situation.



On Fri, Feb 6, 2009 at 1:59 PM, Dominik Klein <dk at in-telegence.net> wrote:

> Romi Verma wrote:
> > Thanks for fast reply ,
> > Ok, Let me explain the situation. i have two nodes cluster . i pulled out
> > the network cable of one
> > node which produced spilit brain situation. this time both nodes are
> > thinking that other one is dead.  each node is thinking itself as DC and
> on
> > each node cluster is up and running without quorum.
> >
> > i am new to openais/pacemaker so dont know much but according to some
> > documents it seems by default no-quorum-policy is  to "stop" the cluster.
> i
> > have not specified any no-quorum-policy that's why i expect that my
> cluster
> > should stop if it looses quorum somehow.
>
> The "stop" refers to the resources. policy=stop on a node with no quorum
> means: do not run any resources.
>
> "ignore" would mean: run resources even though we don't have quorum
> (like the old heartbeat behaviour would be)
>
> "freeze" would mean: run and manage what you did run up to this point,
> but don't aquire any other resources.
>
> Regards
> Dominik
>
> > But in present spilit brain situation , on each node cluster is up and
> > running without quorum.   could you please explain why this is happening.
> >
> > Romi
> >
> >
> > On Fri, Feb 6, 2009 at 12:52 PM, Andrew Beekhof <beekhof at gmail.com>
> wrote:
> >
> >> Well the no-quorum-policy option applies during the split and an
> election
> >> is held to determine the DC when the partitions reform.
> >> Can you be more specific please?
> >> On Feb 6, 2009, at 4:54 AM, Romi Verma wrote:
> >>
> >>
> >>
> >> hi all,
> >>> how does openais + pacemaker (suse 11) cluster handles spilit brain
> >>> situation .  can any one explain.
> >>>
> >>> Thanks,
> >>> Romi.
> >>>
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