NS0-594 NetApp Certified Support Engineer ONTAP Specialist Practice Questions
Prepare for NS0-594 with more than an answer.
- 1
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: A
'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.
- 2
While investigating an ONTAP OS management hang where CLI commands through the console take over 90 seconds to respond, an engineer determines that the 'mgwd' process on node-02 has entered an unrecoverable deadlock. Which command restarts this management process without impacting client data I/O or triggering controller failover?
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Correct answer: A
ONTAP uses the Service Process Monitor (spm) to oversee user-space daemons like mgwd, vldb, and bcom. Restarting mgwd terminates only the management gateway daemon; ONTAP's kernel and data path (WAFL, networking, FCP, iSCSI, NFS, SMB) remain completely operational, avoiding client disruption.
- 3
Following an unexpected controller reboot on an AFF A800 node, an engineer needs to verify whether a panic event occurred and inspect the resulting core dump file. Which ONTAP CLI command displays the saved core dump status and panic string?
flowchart LR Panic[Node Panic Event] --> Dump[Write Coredump to Disk] Dump --> Reboot[Controller Reboot / SFO] Reboot --> CLI[Run Diagnostic Verification Command]Show answer details
Correct answer: A
'system node coredump show' lists all saved kernel and application core dump files across nodes in the cluster, along with their creation timestamps, size, panic string, and whether they have been saved from the dump area to the root volume.
- 4
A financial enterprise operates a mission-critical 2-node AFF A900 cluster hosting ultra-low-latency SQL databases. During an unexpected power transient affecting rack A, node-01 suffers a kernel panic and halts.
Node-02 immediately detects the heartbeat loss over the HA interconnect and successfully executes a Storage Failover (SFO) takeover, mounting node-01's aggregates and continuing data service.
After power is restored to rack A, node-01 boots up to the 'Waiting for giveback...' prompt at the loader console. However, when the storage engineer runs 'storage failover giveback -ofnode node-01', the giveback operation is aborted with a veto message stating that uncommitted NVRAM data or pending disk sanitization / long-running operations are active on node-02.
What is the correct troubleshooting sequence to safely complete the giveback without risking data corruption or an outage?
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Correct answer: A
ONTAP provides 'storage failover show-giveback' specifically to diagnose why a giveback was vetoed. Vetoes occur to protect active I/O, allow NVRAM replays, or prevent disruption of processes that cannot be paused. Overriding vetoes indiscriminately (e.g., using '-override-vetoes true') without diagnosing the underlying veto reason can lead to application crashes or filesystem inconsistencies.
- 5
A storage support engineer is investigating unexpected warning messages on an ONTAP 9 cluster. When running the command 'event log show' with no additional parameters, which event severity levels are displayed by default?
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Correct answer: A
According to official ONTAP documentation, 'event log show' displays events of severity EMERGENCY, ALERT, and ERROR by default. To view NOTICE, INFORMATIONAL, or DEBUG events, an administrator must explicitly pass the '-severity' parameter.
- 6
During an unscheduled maintenance call, an engineer needs to immediately generate and transmit a full diagnostic telemetry bundle for node-01 to NetApp Active IQ support without waiting for the scheduled weekly transmission. Which ONTAP CLI command performs this task?
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Correct answer: A
The command 'system node autosupport invoke' triggers an on-demand AutoSupport message collection. Specifying '-type all' ensures that the complete diagnostic bundle is gathered and transmitted, while '-message' adds custom tracking text such as a support case number.
