This document provides an introduction to Oracle 12c high availability features such as Flex ASM, Flex Cluster, and Flex ASM Clusters. It discusses the Oracle Database File System (DBFS) and Oracle Automatic Storage Management (ASM) technologies. The document outlines the steps to configure a Flex Cluster and convert a standard cluster to a Flex Cluster. It also provides instructions for converting a node role from hub to leaf and configuring Oracle Grid Infrastructure failover services.