Hi, I'm using Redhat Cluster Suite 7with watchdog timer based fence agent. I understand this is a really bad setup but this is what the end-user wants.
ATB => auto_tie_breaker "When the auto_tie_breaker is used in even-number member clusters, then the failure of the partition containing the auto_tie_breaker_node (by default the node with lowest ID) will cause other partition to become inquorate and it will self-fence. In 2-node clusters with auto_tie_breaker this means that failure of node favoured by auto_tie_breaker_node (typically nodeid 1) will result in reboot of other node (typically nodeid 2) that detects the inquorate state. If this is undesirable then corosync-qdevice can be used instead of the auto_tie_breaker to provide additional vote to quorum making behaviour closer to odd-number member clusters." Thanks On Sun, 29 Apr 2018 at 02:15, Digimer <li...@alteeve.ca> wrote: > On 2018-04-28 09:06 PM, Wei Shan wrote: > > Hi all, > > > > If I have a 2 node cluster with ATB enabled and the lowest node ID node > > has failed. What will happen? My assumption is that the higher node ID > > node will self fence and be rebooted. What happens after that? > > > > Thanks! > > > > -- > > Regards, > > Ang Wei Shan > > Which cluster stack is this? I am not familiar with the term "ATB". > > If it's a standard pacemaker or cman/rgmanager cluster, then on node > failure, the good node should block and request a fence (a lost node is > not allowed to be assumed gone via self fence, except when using a > watchdog timer based fence agent). If the fence doesn't work, the > survivor should remain blocked (better to hang than risk corruption). If > the fence succeeds, then the survivor node will recover any lost > services based on the configuration of those services (usually a simple > (re)start on the good node). > > -- > Digimer > Papers and Projects: https://alteeve.com/w/ > "I am, somehow, less interested in the weight and convolutions of > Einstein’s brain than in the near certainty that people of equal talent > have lived and died in cotton fields and sweatshops." - Stephen Jay Gould > -- Regards, Ang Wei Shan
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