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Oracle Grid Infrastructure: Understanding Split-Brain Node Eviction (Doc ID 1546004.1)

Last updated on MAY 30, 2023

Applies to:

Oracle Database - Enterprise Edition - Version and later
Oracle Database Cloud Schema Service - Version N/A and later
Gen 1 Exadata Cloud at Customer (Oracle Exadata Database Cloud Machine) - Version N/A and later
Oracle Cloud Infrastructure - Database Service - Version N/A and later
Oracle Database Cloud Exadata Service - Version N/A and later
Information in this document applies to any platform.


The purpose of this note is to explain split-brain node evictions in Oracle Clusterware release 11.2


The intended audience of this note is Oracle Clusterware 11.2 administrators at any level of expertise. As written, this note applies only to 11.2.


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In this Document
 What does "split brain" mean?
 Why is this a problem?
 How does the clusterware resolve a "split brain" situation?
 Identifying a split-brain eviction
 Finding the cohort
 Understanding the cohort message
 Using the cohort message to identify interconnect network issues
 Follow-up Action
 Community Discussions


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