Master NetApp NS0-093 Exam with Reliable Practice Questions

Correct : D

Upgrade Considerations for Disk and CPU Utilization:

During an ONTAP upgrade, it is critical to ensure the system has sufficient resources to handle the upgrade process without impacting normal operations.

Recommended Threshold:

NetApp recommends that both disk and CPU utilization should be below 70% before initiating an upgrade. This ensures that there is enough headroom for the upgrade operations and avoids performance degradation.

Steps to Verify Utilization:

Use the system node show -fields cpu command to check CPU usage.

Use the storage aggregate show -fields used command to check aggregate disk utilization.

NetApp Reference Documentation:

'ONTAP Upgrade and Maintenance Guide' specifies the 70% threshold for disk and CPU usage during upgrade planning.

The 'ONTAP Performance Management Guide' provides methods for monitoring system resource utilization.

Correct : A

To ensure that POST (Power-On Self-Test) runs on boot, the setenv POST=true command is used at the LOADER prompt. This command enables the system to perform POST diagnostics before proceeding with the boot process.

Key Details:

POST Purpose: POST checks system hardware components (such as memory, disk, and controllers) for faults before loading the ONTAP kernel.

How to Use:

At the LOADER prompt, type:

arduino

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setenv POST=true

Save the configuration and reboot the system.

Why Other Options Are Incorrect:

B . bye:

This command restarts the system but does not ensure that POST runs on boot.

C . boot_diag:

This command boots the system into diagnostic mode but is not directly related to enabling POST on boot.

D . boot_ontap:

This command boots ONTAP but skips POST if it is not explicitly enabled.

NetApp 'ONTAP System Boot and Recovery Guide' describes setenv POST=true for enabling POST diagnostics.

Correct : B

In a SAS stack of shelves, the connection between the expander and the disk uses a point-to-point topology.

Key Details:

Point-to-Point:

Each SAS disk in a shelf connects directly to the expander using a dedicated channel. This ensures that communication between the disk and expander is independent of other disks, improving performance and reliability.

Why SAS Uses Point-to-Point:

SAS (Serial Attached SCSI) eliminates the shared bandwidth limitations of traditional bus architectures (e.g., arbitrated loop or ring) by dedicating a connection to each device.

Why Other Options Are Incorrect:

A . arbitrated loop:

Arbitrated loop is a topology used in Fibre Channel systems, not SAS.

C . loop:

SAS does not use loop-based communication; this is typical of older technologies like SCSI Parallel Interface (SPI).

D . ring:

Ring topology is not used in SAS stacks.

'NetApp SAS Shelf and Disk Configuration Guide' specifies point-to-point communication between expanders and disks in SAS environments.

Correct : A, D

1. L1 Watchdog Reset (WDR):

Description:

L1 WDR is a hardware-initiated reset that occurs when the system detects an unrecoverable error or lockup lasting 0.5 seconds.

Key Characteristics:

It performs a hard reset, meaning the system immediately reboots without creating a core dump.

2. L2 Watchdog Reset (WDR):

Description:

L2 WDR is initiated when the system fails to recover from a critical fault after 2 seconds.

Key Characteristics:

It requests a core dump to capture the system state for diagnostic purposes before performing a reset.

Why Other Options Are Incorrect:

B . L1 WDR is initiated after 0.5 seconds from the event:

This is incorrect because L1 WDR performs a hard reset and does not initiate after 2 seconds.

C . L1 WDR performs a soft reset:

This is incorrect because L1 WDR performs a hard reset, not a soft reset.

'ONTAP Panic Analysis Guide' describes the behavior and timing of L1 and L2 WDR events.

NetApp Support documentation on system resets explains the differences between L1 and L2 watchdog resets.

Correct : A

To reset environment variables to factory settings, the set-defaults command is used. This command clears all customizations and restores the environment variables to their default values.

Key Details:

Command Syntax: At the LOADER prompt, type:

arduino

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set-defaults

Effect: This command resets all environment variables (e.g., boot arguments, diagnostic settings) to their original factory defaults.

Why Other Options Are Incorrect:

B . unsetenv all:

This command clears all environment variables, but it does not restore them to factory defaults.

C . setenv factory:

This is not a valid command in NetApp systems.

D . wipeconfig:

This command is used to clear configuration and logs but does not reset environment variables.

NetApp 'System Configuration Guide' confirms the use of set-defaults for restoring environment variables to factory settings.