Free Netapp NS0-093 Practice Exam with Questions & Answers | Set: 2

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.

Enter maintenance mode, and run:

How to Use:disk show –v

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

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.

Why Other Options Are Incorrect:

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

References:

If a disk is marked as failed, the Failure Byte on the disk indicates that the disk has been flagged for failure. This can be cleared using the following methods:

What it does:Physically remove the disk from the shelf and reseat it. This action can trigger the system to re-evaluate the disk's status and clear the Failure Byte if the failure was transient or due to connection issues.

1. Reseat the Disk

What it does:Using the disk unfail command in maintenance mode clears the Failure Byte and returns the disk to service.

Command Example:

2. Unfail the Diskdisk unfail

A. Power cycle the disk shelf:

Power cycling the shelf may clear other transient hardware issues but does not specifically clear the Failure Byte.

C. Update the disk firmware:

While updating firmware can prevent future issues, it does not address disks already marked as failed.

Why Other Options Are Incorrect:

NetApp "Disk Maintenance Guide" explains procedures to address failed disks.

The "ONTAP Command Reference" covers the disk unfail command for clearing the Failure Byte.

References:

 Purpose of the -cfo-only true Option:

This option is used during the giveback process in a NetApp cluster to control which aggregates are returned to the original node.

By specifying -cfo-only true, only the data aggregates are given back to the original node, while the root aggregate remains with the takeover node.

 Use Case:

This command is helpful when you want to test the aggregate giveback functionality or if the root aggregate requires further investigation or maintenance before returning it to the original node.

 NetApp Reference Documentation:

The "ONTAP High-Availability Configuration Guide" and "Cluster Failover Management Guide" detail the behavior of the -cfo-only option during giveback scenarios.

Reverting to a previous ONTAP version requires careful preparation because ONTAP upgrades often introduce irreversible changes. To successfully revert, the following actions are needed:

C. Reinstall your boot media and install ONTAP 9.5 software

Explanation:You need to reinstall the older version of ONTAP (9.5) on the boot media because the current version (9.7) has been installed as part of the upgrade. The reinstallation ensures that the system boots with ONTAP 9.5.

Steps:

Boot the node into maintenance mode.

Perform the reinstallation using the appropriate ONTAP 9.5 image.

D. Wipe your config and restore from backup

Explanation:A revert requires wiping the configuration because ONTAP upgrades may have made changes to the cluster configuration or WAFL metadata. Restoring the configuration from a backup ensures consistency with the older ONTAP version.

Steps:

Back up the current cluster configuration before proceeding.

Use the restored backup after the revert is complete to reconfigure the system.

Why the Other Options Are Incorrect:

A. Revert from ONTAP 9.7 software to ONTAP 9.6 software and then to ONTAP 9.5 software:

Incorrect. ONTAP reverts must directly target the desired version. You cannot perform multi-step reverts.

B. Delete all Snapshot copies from the past two days:

Incorrect. Deleting Snapshot copies is not a prerequisite for reverting ONTAP. While older Snapshot copies might not be compatible with the reverted version, they do not need to be deleted before the revert.

References:

NetApp Documentation: ONTAP Upgrade and Revert Procedures.

NetApp Knowledge Base: Steps for reinstallation and configuration restoration during a revert.

To replace a drawer in a DS460c shelf, the following steps must be taken:

Why this is required:Cable chains connect the drawer to the shelf and must be disconnected to safely remove the drawer.

1. Disconnect the cable chains from the chassis

Why this is required:Drives must be removed to avoid damage during the drawer replacement process and to reduce the weight of the drawer for safe handling.

2. Evacuate all drives in the drawer

A. Shut down both nodes:

This is unnecessary because DS460c shelves support online replacement, and the system can remain operational.

C. Power off the shelf:

This is also unnecessary. DS460c shelves are hot-swappable, meaning they do not require the shelf to be powered down.

Why Other Options Are Incorrect:

"DS460c Hardware Service Guide" explains the procedure for replacing a drawer.

NetApp’s "Field Replacement Guide" for DS460c shelves emphasizes online and hot-swappable replacements.

References:

To view information about installed Field Replaceable Units (FRUs) using the Service Processor, the following commands are used:

What it does:Displays a list of all installed FRUs, such as disks, power supplies, and fans.

Example Usage:

1. system fru listsystem fru list

What it does:Provides detailed information about specific FRUs, including serial numbers, statuses, and hardware details.

2. system fru showsystem fru show

C. system sensors show:

This command displays sensor data (e.g., temperature, voltage) but does not list FRUs.

D. system power status:

This command shows power supply status but does not provide FRU details.

Why Other Options Are Incorrect:

"Service Processor Commands Guide" from NetApp provides a comprehensive overview of system fru list and system fru show.

References:

 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.

To recover an inconsistent aggregate, the following tools can be used:

What it does:This tool is used to perform a consistency check on WAFL metadata. It identifies and attempts to fix WAFL inconsistencies in aggregates.

When to use:Run wafl_check after identifying WAFL inconsistencies to repair minor metadata issues.

1. wafl_check

What it does:This tool repairs WAFL inconsistencies by reconstructing metadata. It is more powerful than wafl_check and should only be run under NetApp Support guidance, as improper use can result in data loss.

When to use:Use wafliron for severe WAFL inconsistencies that cannot be resolved by wafl_check.

2. wafliron

A. file check:

This is not a valid NetApp tool.

C. wafl snapiron:

While similar in name, snapiron is used for snapshot recovery, not aggregate recovery.

Why Other Options Are Incorrect:

"ONTAP Aggregate Troubleshooting Guide" details the usage of wafl_check and wafliron.

NetApp Support documentation provides guidelines for recovering inconsistent aggregates.

References: