NS0-594 Sample Questions & Answers
Cluster administration and data-replication troubleshooting carries the most weight, close ahead of hardware and Fibre Channel component issues, with the rest on NAS, SAN and S3 protocol configurations plus performance and software-defined ONTAP concepts.
Launch the full NS0-594 simulator →Showing 6 of 12 free samples.
- Question 1Advanced
ONTAP OS · Cluster and node administration
A support specialist observes that the command 'cluster ring show' indicates the 'mgwd' unit is offline or in a master-less state across two nodes in an 8-node cluster, while all other rings (vldb, vifmgr, bcom) show healthy quorum.
flowchart TD subgraph RDB_Rings [Replicated Database Rings] VLDB[VLDB: In Quorum / Master Elected] VIFMGR[VIFMGR: In Quorum / Master Elected] BCOM[BCOM: In Quorum / Master Elected] MGWD[MGWD: Offline / Quorum Lost] end RDB_Rings --> Effect{Impact on Storage System}What is the direct operational impact on the ONTAP cluster?
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Correct answer: D
The mgwd (Management Gateway Daemon) ring manages cluster management transactions, CLI, REST API, and System Manager sessions. Because the volume location database (vldb) and virtual interface manager (vifmgr) rings remain in quorum, data path routing and client I/O continue normally. However, management commands that rely on mgwd synchronization will fail or hang.
- Question 2Intermediate
ONTAP OS · SnapMirror and SnapVault troubleshooting
A scheduled SnapMirror asynchronous update operation repeatedly fails with the status error: 'Transfer failed. (Cannot find common Snapshot copy between source and destination)'. Which troubleshooting workflow is required to restore replication while preserving destination retention history if possible?
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Correct answer: A
SnapMirror relies on an identical common base Snapshot copy on both source and destination volumes. If the common snapshot was inadvertently deleted on the source (e.g., due to autodelete or manual cleanup), the relationship cannot perform incremental updates. An engineer can identify if any other common snapshot exists or execute 'snapmirror resync' pointing to a valid shared snapshot. If no common Snapshot copy remains anywhere, a full re-initialization is required.
- Question 3Intermediate
ONTAP OS · SnapMirror and SnapVault troubleshooting
When diagnosing a failing SnapMirror relationship across two peered clusters, an engineer executes 'cluster peer health show' and discovers that Ping Status shows 'reachable' but Data Operation Status reports 'unreachable' on node-02. What is the most probable root cause?
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Correct answer: C
ONTAP cluster peering uses ICMP for basic reachability tests (ping), but data replication and RPC control operations require TCP ports 11104 (intercluster communication) and 11105 (data transfer). If a firewall permits ICMP but blocks these specific TCP ports, Ping Status will succeed while Data Operation Status reports unreachable.
- Question 4Intermediate
ONTAP OS · ONTAP software architecture
In ONTAP's WAFL (Write Anywhere File Layout) file system architecture, what is the role of a Consistency Point (CP)?
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Correct answer: B
A Consistency Point (CP) is the mechanism whereby WAFL freezes the state of in-memory dirty buffers and writes them out to disk in a self-consistent block tree structure. Once the CP completes successfully, the corresponding transaction log entries held in NVRAM/NVDIMM can be safely reclaimed.
- Question 5Beginner
ONTAP OS · ONTAP software architecture
A storage administrator notices that after node-01 recovered from a planned reboot, a critical NAS data LIF remained hosted on node-02 instead of returning to its primary physical port on node-01. What configuration setting explains this behavior?
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Correct answer: C
In ONTAP network interface configuration, the '-auto-revert' parameter dictates whether a LIF automatically migrates back to its configured home node and home port once that port returns to an operational state. If '-auto-revert' is false, the LIF remains on the current failover target until manually reverted.
- Question 6Intermediate
ONTAP OS · OS-level fault isolation
A customer reports that active health alerts are present on their AFF A400 cluster. Which ONTAP command provides the specific corrective actions, probable cause, and resource identifier for active subsystem alerts?
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Correct answer: B
'system health alert show' lists active subsystem alerts across the cluster. Adding the '-instance' parameter displays comprehensive details, including the probable cause, alert ID, resource involved, and specific step-by-step corrective actions to remediate the fault.
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