hello, On 10/25/2011 08:42 AM, Ulrich Windl wrote: > Hi! > > According to my experience, each node will STONITH the other node happily > until communication is re-established. A split brain in a two-node cluster > doesn't create two one-node clusters. >
... from my experience ... without stonith configured the two nodes will run happily all resources on their own, concurrently. With stonith enabled -- nodes wait for successful fencing before resource takeover -- you should most of the time get two sub-cluster. They try to fence each other which is (hopefully) not successful because the network is not available -- and one of your cluster communication networks should also include the stonith network addresses (assuming you have network managed fencing devices) ... then once the stonith network is recovered fencing might happen or the two-node-cluster reforms ... some sort of a race Worst case: stonith network is working but not used for cluster communication -- you get a nice stonith death match and the nodes happily kill each other ... again and again ... except you don't start cluster services on bootup or detect reboot cycles ... Regards, Andreas -- Need help with Pacemaker? http://www.hastexo.com/now > Regards, > Ulrich > >>>> Hai Tao <[email protected]> schrieb am 25.10.2011 um 05:49 in Nachricht > <[email protected]>: > >> In case heartbeat communication is lost, brain split then happened, both >> nodes (a two nodes cluster for a simple example) are having the vip and >> other >> resources. >> >> When the heartbeat commnication comes back, what will happen? >> >> 1. both nodes will still having the vip and resources forever? >> 2. both nodes realize that brain split has happened, and will restart >> heartbeat? >> >> >> Thanks. >> >> Hai Tao >> _______________________________________________ >> Linux-HA mailing list >> [email protected] >> http://lists.linux-ha.org/mailman/listinfo/linux-ha >> See also: http://linux-ha.org/ReportingProblems >> > > > > > _______________________________________________ > Linux-HA mailing list > [email protected] > http://lists.linux-ha.org/mailman/listinfo/linux-ha > See also: http://linux-ha.org/ReportingProblems
signature.asc
Description: OpenPGP digital signature
_______________________________________________ Linux-HA mailing list [email protected] http://lists.linux-ha.org/mailman/listinfo/linux-ha See also: http://linux-ha.org/ReportingProblems
