ASM on a Four-Node Cluster: True Statements
Short answer
ABE ACFS can be deployed on any nodes, database instances can be clients of remote ASM instances, and ASM serves as an I/O server for disk groups.
Question
Key Takeaways
The core concept is client-server architecture of ASM; the common trap is assuming local-only binding or misinterpreting ACFS restrictions.
This question examines the interaction between database instances and ASM instances in a RAC environment. It establishes that ACFS is flexible, database instances can connect to remote ASM, and ASM acts as an I/O server.
Common mistake: Many candidates incorrectly select D (local only) because they confuse ASM with local file systems, failing to recognize the distributed nature of Oracle RAC storage.
Expert Analysis
Why the Answer Is Correct
Option A is correct because Oracle ACFS can be deployed on any node within the cluster to store application data, though it cannot host Oracle binaries. Option B is correct because a database instance in a RAC environment acts as a client to ASM instances across the entire cluster, not just locally. Option E is correct because the fundamental role of an ASM instance is to provide I/O services to database instances for managing disk groups.
Why the Other Options Are Wrong
Option C is incorrect as it directly contradicts the distributed nature of RAC where clients can access remote servers. Option D is incorrect because it restricts connections to the same node, ignoring the global visibility and connectivity provided by Clusterware.
Community Comment Notes
Commenters like Tunglinfo9 emphasize that ACFS has specific restrictions on storing Oracle homes, which clarifies why 'any nodes' refers to application use cases rather than software installation. Other users like krwi1 simply note that option E is wrong, but this is actually incorrect reasoning as E is a true statement about ASM's function. The consensus leans towards AB, often missing E due to confusion over the term 'diskgoups' (typo for diskgroups) or misunderstanding ASM's server role.
Exam Strategy
Remember that ASM operates as a client-server model across all nodes in a RAC cluster. Always verify if options describe local-only constraints when the technology is inherently distributed.
Frequently Asked Questions
Why can't ACFS hold Oracle Grid Infrastructure homes?
Can a DB instance connect to ASM on a different node?
Discussion 3 contributions
Compiled from public community threads and reader submissions, lightly edited for clarity. Handles and vote tallies are shown as recorded, and comments reflect the views of individual contributors.
From public community threads 3
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Tunglinfo9 👍 1A: ASM Cluster File System (ACFS) can be deployed on any nodes. False Oracle ACFS file systems cannot be used for an Oracle base directory or an Oracle Grid Infrastructure home that contains the software for Oracle Clusterware, Oracle ASM, Oracle ACFS, and Oracle ADVM components. However, Oracle ACFS file systems can be configured for use as a home for applications. E: A database instance on a node uses an ASM instance as an I/O server when requesting I/O to disk groups. True When a database instance creates or opens an Oracle ASM file, it communicates those requests to the Oracle ASM instance. The ASM instance then provides file extent map information to the database instance. In the case where the database instance is on a node that does not have direct access to Oracle ASM disks, the database instance uses an Oracle IOServer (I/O Server) instance to access the storage.
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krwi1 👍 3E is wrong
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217972f 👍 1100% ABF
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