Split-Brain Situations are *very* critical for a two node setup, aspecially when you are using shared media like disks drbd syncs and so on.
For bigger clusters the problem is a bit more easy, bevause you get a quorum loss, if half the nodes are "down" or disconnected. You can use the directive for the no_qurum (ignore, *stop*, fence) to make that stable - the ressources are stopped, ehen you use the value stop for that directive. For a two node setup you run the twonode quorum plugin, which does not stop the ressources in the case of a split (if I got that correctly teh quorum is not lost). Thus both nodes *could* aquire the resources. To come out of those problems you need to setup STONITH (server fencing) resources. In your setup you would need something like a management board, remote power switch,... so one node could switch-off or reboot the other one. Once the rebooted node comes up it should not automatically restart heartbeat, to avoid running into a second split brain situation. ----- Original Nachricht ---- Von: Doug Lochart <[EMAIL PROTECTED]> An: General Linux-HA mailing list <[email protected]> Datum: 15.02.2008 03:40 Betreff: [Linux-HA] Split-Brain occurrence, what do I do now? > > I am really confused. I am following a tutorial and I go right into a > split brain. I can't see how it would have been any different if I > yanked the power cord versus yanking the cables. I thought this is > what heartbeat was supposed to handle? > > How do I recover? No data was lost as I was just doing an initial test. > What is it I need to do to prevent a split-brain from happening again? > > Is there a good place to go to read about avoiding this situation? > Much of the info I have found jumps right in as if you are already a > master of this stuff. > In case you need them my configs follow: > >> Viel oder wenig? Schnell oder langsam? Unbegrenzt surfen + telefonieren ohne Zeit- und Volumenbegrenzung? DAS TOP ANGEBOT FÜR ALLE NEUEINSTEIGER Jetzt bei Arcor: günstig und schnell mit DSL - das All-Inclusive-Paket für clevere Doppel-Sparer, nur 29,95 Euro inkl. DSL- und ISDN-Grundgebühr! http://www.arcor.de/rd/emf-dsl-2 _______________________________________________ Linux-HA mailing list [email protected] http://lists.linux-ha.org/mailman/listinfo/linux-ha See also: http://linux-ha.org/ReportingProblems
