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What are two options to remove Failure Byte on disks that are marked as failed? (Choose two.)
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:
1. Reseat the Disk
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.
2. Unfail 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:
disk unfail <disk_name>
Why Other Options Are Incorrect:
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.
NetApp 'Disk Maintenance Guide' explains procedures to address failed disks.
The 'ONTAP Command Reference' covers the disk unfail command for clearing the Failure Byte.
Which two statements are correct when describing L1 and L2 Watch Dog Resets (WDR)? (Choose two.)
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.
When you add a new disk to an ONTAP 9.1 system, you see an error that the disk ''has raid label with version (16), which is not within the currently supported range (14-15).'' What is one possible cause of this error?
Explanation of RAID Label Versions:
Disks in ONTAP systems contain metadata known as RAID labels. These labels store critical information such as ownership, aggregate membership, and versioning.
The error indicates a mismatch between the RAID label version on the disk and the supported versions of the ONTAP system.
Why Option D Is Correct:
If a disk has a RAID label created by a newer version of ONTAP (e.g., version 16) and is then inserted into a system running an older version of ONTAP (e.g., supporting versions 14-15), the label will not be recognized.
This mismatch causes ONTAP to reject the disk.
Resolution:
Upgrade the ONTAP version to match the RAID label on the disk.
Alternatively, zero the disk to reset its RAID label, but this will erase all data on the disk.
NetApp Reference Documentation:
The 'ONTAP Disk Management Guide' and 'ONTAP Compatibility Matrix' explain RAID label versions and compatibility issues when moving disks between ONTAP systems.
Which two of the following methods are valid ways to access a node which is not booting? (Choose two.)
If a node is not booting, the following methods can be used to access the system for troubleshooting:
1. Service Processor (SP)
What it does: The SP provides out-of-band management access to the node, even if the node is not booting.
How to use:
Connect to the SP using SSH or a direct console connection.
Use SP commands to gather logs or perform diagnostics.
2. Serial Console
What it does: The serial console provides direct access to the node's bootloader or maintenance mode.
How to use:
Connect to the serial port using a terminal emulator.
Use console commands to interact with the system.
Why Other Options Are Incorrect:
A . node management port:
The node management interface is only accessible if the node is booted and ONTAP is running.
B . cluster management port:
The cluster management interface requires the cluster to be operational, which is not possible if the node is not booting.
NetApp 'Service Processor and Serial Console Guide' provides instructions for accessing a non-booting node.
You have created a case with NetApp Support for an issue with a DS4246 shelf on an ONTAP 9.12.1 system. They have requested that you provide shelf logs.
What action do you need to take to collect the shelf logs?
To collect shelf logs for a DS4246 shelf in an ONTAP 9.12.1 system, you must invoke a diagnostic AutoSupport specifically targeting the storage subsystem. This action ensures that detailed storage logs, including shelf logs, are included in the AutoSupport bundle.
Steps to Collect Shelf Logs:
Use the following command:
bash
Copy code
system node autosupport invoke -node <node_name> -type diagnostic -subsystem storage
Replace <node_name> with the name of the node experiencing the issue.
This command generates an AutoSupport message that includes logs related to storage subsystems, such as disk shelves and adapters.
Provide the AutoSupport case number to NetApp Support for further analysis.
Why Other Options Are Incorrect:
A . Provide the output of the nodeshell command rdfile /etc/log/shelflog:
While this command allows manual reading of shelf logs, it is not a recommended or comprehensive approach for collecting logs for NetApp Support cases.
B . Invoke an AutoSupport of type all using Active IQ Unified Manager:
This action generates a generic AutoSupport bundle, which may not include detailed shelf logs unless explicitly targeted.
D . Invoke a diagnostic AutoSupport with the subsystem log_files:
The log_files subsystem targets general system logs, not storage-specific logs like shelf logs.
'ONTAP 9 AutoSupport and Diagnostics Guide' outlines the use of the subsystem storage option for collecting shelf logs.
The 'Troubleshooting Storage Subsystems' documentation specifies diagnostic AutoSupport as the method for gathering shelf-related logs.
