Get NetApp NS0-093 Exam Practice Questions - Real and Updated

Answer : C

What Is a Watchdog Timeout?

The watchdog is a software or hardware mechanism that monitors the system's health and ensures it is operating correctly.

If the system fails to respond or update the watchdog timer within the specified time, the watchdog triggers a system panic to avoid further corruption or damage.

Cause of Watchdog Timeout:

This usually occurs due to:

A hardware failure (e.g., CPU or memory issue).

A software bug causing a system hang or crash.

The panic ensures the system stops operation to preserve data integrity and aid in troubleshooting.

NetApp Reference Documentation:

'ONTAP Troubleshooting Guide' and 'Core Dump Analysis Guide' provide details on interpreting watchdog timeouts and recommended actions.

Answer : C, D

1. During a Negotiated Takeover:

Description:

When a negotiated takeover occurs (e.g., for maintenance or upgrades), NVRAM data is replayed by the HA partner to ensure no data is lost.

Relevance:

This ensures that all pending writes are safely processed by the partner node.

2. When the Node Loses Power:

Description:

If a node loses power unexpectedly, the HA partner replays the mirrored NVRAM data to protect active write operations.

Why Other Options Are Incorrect:

A . after triggering a sync core:

Triggering a sync core does not involve NVRAM replay; it captures the system state for debugging.

B . when a node is halted:

Halting a node does not trigger NVRAM replay unless it is part of a negotiated takeover.

'ONTAP High Availability Guide' explains NVRAM mirroring and replay during failover scenarios.

Answer : A

A NetApp WAFL (Write Anywhere File Layout) inconsistency in a RAID-DP aggregate could occur in the following scenarios:

1. Two disks failing and a block error during reconstruction

Why this causes inconsistency:

RAID-DP is designed to handle up to two concurrent disk failures. However, if a block error occurs during the reconstruction process (e.g., unreadable data on the surviving disks), the RAID group cannot rebuild the lost data, leading to WAFL inconsistencies.

2. Two disks failing within seconds of each other

Why this causes inconsistency:

If two disks in the same RAID group fail nearly simultaneously (before the RAID-DP can reconstruct data from the first failed disk), the system cannot recover the data, resulting in WAFL inconsistencies.

Why Other Options Are Incorrect:

B . rebooting a node during a disk reconstruction:

Rebooting a node does not cause WAFL inconsistency because ONTAP ensures that RAID reconstructions resume upon reboot without data loss.

D . both party disks failing:

This is not a valid RAID-DP term.

'WAFL and RAID-DP Operations Guide' explains failure scenarios that could cause inconsistencies.

NetApp's 'Troubleshooting RAID Groups and Aggregates' covers recovery procedures for double-disk failures and reconstruction errors.

Answer : B

On a FAS9000 system running ONTAP 9.12.1, the kernel core file is stored on the root aggregate. This is the default location where ONTAP writes kernel core files for system-level failures.

Key Details:

The root aggregate is the aggregate that contains the root volume for a given node in the cluster. This aggregate is used for critical system files and logs, including kernel core files.

When a kernel panic or other critical failure occurs, the core dump is written to the root aggregate for later analysis by NetApp Support.

Why Other Options Are Incorrect:

A . on the partner root aggregate: The partner root aggregate is not used for storing core files unless explicitly configured (which is not the default behavior).

C . on the mailbox disk: The mailbox disk is used for cluster quorum and configuration information, not for storing core files.

D . on the boot device: The boot device contains ONTAP software and boot files but does not store kernel core dumps.

'ONTAP System Administration Guide' specifies that core files are stored on the root aggregate.

NetApp's 'Troubleshooting and Diagnostics Guide' confirms the default behavior for kernel core file storage.

Answer : B

In maintenance mode, the command disk show --v provides detailed information about disk ownership. This includes the current owner, previous owner, and disk health status.

How to Use:

Enter maintenance mode, and run:

disk show --v

The output will display ownership information for each disk, including its RAID group and current assignment.

Why Other Options Are Incorrect:

A . sysconfig --v:

This command provides system configuration details but does not show disk ownership.

C . aggr status:

This command shows the status of aggregates, not individual disks or their ownership.

D . storage show disk --p:

This command is not valid in maintenance mode.

NetApp 'Maintenance Mode Commands Guide' highlights disk show --v as the command to check disk ownership.