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What is split brain?

brain Split
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What is split brain?

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A split brain occurs when two independent systems configured in a cluster assume they have exclusive access to resources. In SFW HA (VERITAS Cluster Server) this scenario can be caused when all cluster heartbeat links are simultaneously lost. Each cluster node will then mark the other cluster node as FAULTED. This is known as a “network partition”. This is represented in the figure below: This scenario is possible when both of the LLT (Low Latency Transport cluster communication links) are connected to Node 3 via the same IP network, for example, the same network switch. This configuration of the common network switch needs careful consideration in Replicated Data Cluster (RDC) where Node 3 may be located in another Data Centre to get LLT links over separate network infrastructure. What happens in a split brain? Under cluster logic, VCS will online any groups that it now considers faulted. The service groups however will be online on the other cluster node(s), that have formed a new cl

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