NetApp NS0-093 Exam Questions

To trigger an AutoSupport message in ONTAP, the following commands are valid:

1. ::> autosupport invoke --node <nodename> --type all

What it does: This command manually triggers a complete AutoSupport message of type 'all.' This includes logs and system information from all subsystems.

How to use:

Run the command: autosupport invoke --node <nodename> --type all

Replace <nodename> with the name of the node for which you want to generate the AutoSupport message.

Why it's relevant: This is the primary method for triggering a full AutoSupport message manually. It is commonly used during troubleshooting to provide comprehensive system data to NetApp Support.

2. ::> autosupport invoke-core-upload --node <nodename>

What it does: This command is specifically used to upload core files (e.g., kernel or user space cores) from a node to NetApp Support for analysis.

How to use:

Run the command: autosupport invoke-core-upload --node <nodename>.

Replace <nodename> with the name of the node for which you want to upload core files.

Why it's relevant: If there is a system panic or other critical issue, this command ensures that core files are included in the AutoSupport message for detailed analysis.

Why Other Options Are Incorrect:

A . ::> autosupport history show-upload-details --node <nodename>:

This command displays the history of AutoSupport uploads but does not trigger a new AutoSupport.

B . ::> system node coredump upload --node <nodename>:

This command uploads coredumps directly to a support server but does not trigger an AutoSupport message.

'ONTAP 9 AutoSupport Configuration Guide' confirms autosupport invoke as a valid command to trigger AutoSupport messages.

'ONTAP CLI Reference Manual' specifies autosupport invoke-core-upload for core file uploads.

Understanding a Single PHY Down Issue:

In SAS environments, a PHY represents a physical layer connection between devices.

When a single PHY reports a 'down' status, it typically indicates an issue with the physical connectivity or the associated hardware.

Cause 1: Improperly Seated Cable

If the SAS cable is not properly seated in the port, the connection for one or more PHYs may fail.

Reseating the cable on both ends (controller and shelf) often resolves the issue.

Cause 2: Defective Cable

A damaged or faulty SAS cable can cause PHY errors.

Replacing the cable and verifying the connection resolves the issue in this case.

Why Other Options Are Not Likely:

B . Outdated IOM firmware: While outdated firmware can cause other issues, it rarely affects only a single PHY.

D . Offline shelf: If an entire shelf is offline, more than one PHY would typically be affected, as multiple connections are involved in SAS stacks.

NetApp Reference Documentation:

Found in the 'ONTAP SAS Cabling Guide' and 'Shelf Troubleshooting Guide'. These documents detail troubleshooting for PHY errors and common SAS hardware issues.

A . NVMEM battery

Explanation: The NVMEM (Non-Volatile Memory) battery is a critical component for retaining data in case of a power failure. It is classified as a Field Replaceable Unit (FRU) in an AFF A220 system.

Replacement Notes:

Replacement can be performed by field engineers.

The system will typically alert you when the battery requires replacement.

B . mSATA boot device

Explanation: The mSATA (mini-SATA) boot device contains the ONTAP operating system and is also a FRU in the AFF A220. It is critical for the system's boot process and can be replaced if it becomes faulty.

Replacement Notes:

Boot devices are easily replaceable while ensuring ONTAP is reinstalled on the new device.

Why the Other Options Are Incorrect:

C . NVMe Flash Cache feature:

Incorrect. NVMe Flash Cache is not a physical FRU but a feature for accelerating read performance. It is implemented via software and NVMe-based SSDs, which are not specifically field replaceable in AFF A220.

D . Chassis fan:

Incorrect. The AFF A220 does not classify chassis fans as FRUs. These are usually part of the cooling system, but their replacement may require system shutdown or is integrated into the design.

NetApp Hardware Documentation: AFF A220 Component Replacement Guide.

NetApp Knowledge Base: Articles on replacing NVMEM batteries and mSATA boot devices.

To trigger an AutoSupport message in ONTAP, the following commands are valid:

1. ::> autosupport invoke --node <nodename> --type all

What it does: This command manually triggers a complete AutoSupport message of type 'all.' This includes logs and system information from all subsystems.

How to use:

Run the command: autosupport invoke --node <nodename> --type all

Replace <nodename> with the name of the node for which you want to generate the AutoSupport message.

Why it's relevant: This is the primary method for triggering a full AutoSupport message manually. It is commonly used during troubleshooting to provide comprehensive system data to NetApp Support.

2. ::> autosupport invoke-core-upload --node <nodename>

What it does: This command is specifically used to upload core files (e.g., kernel or user space cores) from a node to NetApp Support for analysis.

How to use:

Run the command: autosupport invoke-core-upload --node <nodename>.

Replace <nodename> with the name of the node for which you want to upload core files.

Why it's relevant: If there is a system panic or other critical issue, this command ensures that core files are included in the AutoSupport message for detailed analysis.

Why Other Options Are Incorrect:

A . ::> autosupport history show-upload-details --node <nodename>:

This command displays the history of AutoSupport uploads but does not trigger a new AutoSupport.

B . ::> system node coredump upload --node <nodename>:

This command uploads coredumps directly to a support server but does not trigger an AutoSupport message.

'ONTAP 9 AutoSupport Configuration Guide' confirms autosupport invoke as a valid command to trigger AutoSupport messages.

'ONTAP CLI Reference Manual' specifies autosupport invoke-core-upload for core file uploads.

Steps to Unfail a Disk in Maintenance Mode:

When a disk is marked as 'failed,' it is added to the Failed Disk Registry and marked as unusable by the system. Unfailing a disk involves removing it from this registry and resetting its state.

Step 1: Remove the Disk from the Failed Disk Registry

Use the command: registry remove <disk> to delete the disk from the Failed Disk Registry. This clears its 'failed' status.

Step 2: Use the Disk Unfail Command

Execute the disk unfail <disk> command to reset the disk status and make it available for use.

Key Notes:

After unfailing, the disk will be treated as a spare and must be reassigned or re-added to an aggregate.

If the disk remains failed after these steps, physical hardware issues may need to be addressed.

NetApp Reference Documentation:

The 'ONTAP Maintenance Mode Guide' and 'Disk Management Guide' provide detailed instructions for handling failed disks and using the disk unfail command.