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| How the agent makes Oracle ASM instance highly available | ||
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| How the agent makes Oracle ASM instance highly available | ||
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Oracle 10g and later provides ASM feature to store and manage the Oracle data that includes data files, control files, and log files. These Oracle data files that are stored in ASM disk groups are called ASM files.
For ASM-managed databases, you must start an ASM instance before you start the database instance. The ASM instance mounts ASM disk groups and makes ASM files available to database instances.
ASM requires Cluster Synchronization Services to enable synchronization between an ASM instance and a database instance.
See Oracle documentation.
The Cluster Server agent for Oracle has the following agents to keep the Oracle ASM instance and ASM disk groups highly available:
ASMInst agent
ASMDG agent
The high availability agent for Oracle continuously monitors the ASM instance and ASM disk groups to verify they function properly.
The Flex ASM functionality intruded in Oracle 12c is supported through ASMDG agent of the VCS agent for Oracle.
For Oracle 10g versions, the VCS agents for Oracle ASM use sysdba role to connect to the ASM instances. For Oracle 11g and later, the agents use sysasm role to connect to the ASM instances.