ASM on a Four-Node Cluster: True Statements
Which three statements are true regarding ASM on a four-node cluster? (Choose three.)
Community Insight
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.
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.
Community Discussion (3 comments)
Comments & Corrections
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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?
Oracle ACFS restrictions prevent storing Oracle Clusterware, ASM, and ADVM components in its file systems to ensure stability and proper management.
Can a DB instance connect to ASM on a different node?
Yes, in a RAC environment, database instances can act as clients to ASM instances running on any node in the cluster via the interconnect.