ExpressCluster X 3.1 for Linux Getting Started Guide - Nec

Error detection mechanismNetwork partition (split-brain-syndrome)When all interconnects between servers are disconnected, failover takes place because the serversassume other server(s) are down. To monitor whether the server is activated, a heartbeatcommunication is used. As a result, multiple servers mount a file system simultaneously causingdata corruption. This explains the importance of appropriate failover behavior in a cluster system atthe time of failure occurrence.A failureoccurs on theother server.A failureoccurs onthe otherservermountmountDataCorruptionFigure 1-6: Network partition problemThe problem explained in the section above is referred to as “network partition” or “split-brainsyndrome.” The failover cluster system is equipped with various mechanisms to ensure shared disklock at the time when all interconnects are disconnected.Section I Introducing ExpressCluster21