On Fri, Feb 6, 2009 at 2:47 PM, Dominik Klein <d...@in-telegence.net> wrote:
> Romi Verma wrote: > > On Fri, Feb 6, 2009 at 2:28 PM, Andrew Beekhof <beek...@gmail.com> > wrote: > > > >> On Feb 6, 2009, at 9:53 AM, Romi Verma wrote: > >> > >> Thanks Dominic, > >> i have two questions now. > >> > >> 1) what does no-quorum-policy= suicide means then?? does it remove the > >> resource completely. > >> > >> > >> no, the node kills itself and any other node in the partition > >> this makes no sense in a 2 node cluster because both nodes will do this > >> > > > > i assume the partition having less nodes will loose quorum and if > > no-quorum-policy is set to suicide then then they will commit suicide. > > like if in 3 nodes cluster , if one node looses communication to other > > nodes then there will be two partitions . one will contain 2 nodes and > > second will contain 1 node. partition having 2 nodes will be having > quorum > > and will not be affected. partition having 1 node will loose quourm and > and > > it will kill itself. is my understanding is right?? > > correct > > > i want the partition without quorum to reset the nodes instead of killing > . > > is it possible. > > define the difference between reset node and kill node? According to me , killing a node means powering it off but reseting a node means rebooting it. > > > >> 2) why each node is thinking itsef as DC as Andrew said after spilit > brain > >> election happens and one node is selected as DC. > >> > >> > >> no, i said after the split-brain is _repaired_ an election occurs. > >> clearly this can't happen during a split-brian because by definition > they > >> can't communicate. > >> > > > > ok got it , so how do we repair this spilit brain condition . by setting > > no-quorum-policy to reset?? or is there any other way also. > > stonith would reboot the node. This means, in case of a clustersoftware > failure that led to loss of communication, the node reboots, restarts > the cluster software and everything should be fine again. so you mean stonith should be used to handle spilit brain situation . but .. but dont you think in two nodes cluster if we get spilit brain situation both node will try to stonith each other. > > > If there's a network problem, you would of course have to fix that ;) :) > > > Regards > Dominik > > >> 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 <d...@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 <beek...@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. > > _______________________________________________ > Pacemaker mailing list > Pacemaker@oss.clusterlabs.org > http://oss.clusterlabs.org/mailman/listinfo/pacemaker >
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