13、Oracle Flex Clusters and Flex Redundancy Disk Groups Guide

Oracle Flex Clusters and Flex Redundancy Disk Groups Guide

1. Oracle Flex Clusters Introduction

In Oracle 12c R1 (12.1), Oracle Flex Clusters were an option. However, starting from 12.2.0.1, the Grid Infrastructure (GI) will automatically configure the cluster for Flex clustering. This type of cluster has hub nodes and leaf nodes, as shown in the following table:
| Node Type | Description |
| — | — |
| Hub Nodes | Core nodes in the cluster |
| Leaf Nodes | Can be added during the initial GI install or later using rapid home provisioning or by cloning the GI home with addnode.sh |

For a cluster upgraded from 12.1 to 12.2 GI, it has the option to enable Flex clustering and add leaf nodes. Initially, all pre - existing c