I/O fencing, also known as split-brain protection, is a mechanism used in Oracle Real Application Clusters (RAC) to prevent data corruption when there is a communication failure between nodes. It works by blocking access to shared storage by a node that is suspected to be out of sync with the rest of the cluster.
I/O fencing is used in RAC to prevent the possibility of two nodes writing to the same data block at the same time, which could result in data corruption. When a communication failure occurs between nodes, the cluster manager (CRS) may decide to block access to shared storage by one of the nodes, effectively "fencing" it off from the rest of the cluster. This prevents the node from accessing shared data and allows the cluster to continue functioning properly without the risk of data corruption.
I/O fencing is an important part of the overall RAC architecture and is essential for ensuring the integrity and consistency of data in a cluster environment. It can also help to prevent downtime and other issues that can arise when communication failures occur between nodes.
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