Which of the following scenarios could result in a NetApp WAFL inconsistency in a RAID DP aggregate?
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.
Which two steps are required to replace a drawer in a DS460c shelf? (Choose two.)
To replace a drawer in a DS460c shelf, the following steps must be taken:
1. Disconnect the cable chains from the chassis
Why this is required: Cable chains connect the drawer to the shelf and must be disconnected to safely remove the drawer.
2. Evacuate all drives in the drawer
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.
Why Other Options Are Incorrect:
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.
'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.
During an ONTAP upgrade, nodeA1 fails to boot. You notice that it is loading the previous version of ONTAP software. What step can be taken to boot the node successfully?
When a node fails to boot and loads the previous version of ONTAP, it usually indicates that the primary boot location is incorrect. To resolve this:
Steps to Boot the Correct ONTAP Version:
Enter the LOADER Prompt:
Interrupt the boot process to access the LOADER prompt.
Set the Primary Kernel URL:
Use the following command:
setenv GX_PRIMARY_KERNEL_URL <URL_to_correct_ONTAP_version>
Boot the Node:
Run the boot command to load the correct version.
Why Other Options Are Incorrect:
B . From the loader prompt of nodeA1, run boot_backup:
Booting the backup image may result in an outdated version of ONTAP, not the desired version.
C . From the clustershell of the partner, run system node image modify:
Modifications to the ONTAP image must be done from the LOADER prompt, not the clustershell.
D . From the clustershell of nodeA1, run system node image modify:
NodeA1 cannot load ONTAP, so this command cannot be run.
'ONTAP System Boot Guide' explains how to resolve boot issues using the LOADER prompt.
NetApp documentation on environment variables includes the use of GX_PRIMARY_KERNEL_URL.
You have upgraded your cluster from ONTAP 9.5 software to ONTAP 9.7 software. After the upgrade, you notice that the upgrade causes issues. You decide to revert to ONTAP 9.5 software.
Which revert step is allowed?
Reverting to a Previous ONTAP Version:
Reverting ONTAP software requires specific procedures and is only supported if the ONTAP version being reverted to is compatible with the current cluster configuration.
Why the Netboot Procedure Is Used:
The netboot process loads the desired ONTAP version directly into memory from a network location and reinitializes the system.
This method is used when a full software revert is required and is often necessary for downgrades to a version that cannot be directly reverted to from the running ONTAP version.
Key Notes:
A direct revert is not supported from ONTAP 9.7 to ONTAP 9.5 using standard methods due to system metadata changes.
Always verify compatibility using the 'ONTAP Software Version Interoperability Matrix'.
NetApp Reference Documentation:
Refer to the 'ONTAP Revert/Downgrade Guide' for specific instructions on using the netboot procedure.
You have replaced a failed boot device. You perform boot_recovery and receive no errors. However, when the node reboots, it reports that it has no disks.
What are two possible causes? (Choose two.)
Possible Causes for 'No Disks' Error:
A (Incorrect SAS Cabling): If the SAS cables are incorrectly reconnected or swapped after replacing the boot device, the disks may not be detected because the physical connection to the shelves is compromised. Verifying and reseating the SAS cables is essential.
C (Lower ONTAP Version): If the node boots into an ONTAP version that is lower than the version previously used, it might not recognize the RAID labels or disk metadata created by the higher ONTAP version.
Why Other Options Are Incorrect:
B (Disks Marked as Failed): Disks that are marked as failed would still be visible in the system, though unusable.
D (Interconnect Down): An interconnect failure affects HA functionality but does not prevent a node from detecting its own disks.
NetApp Reference Documentation:
Refer to the 'ONTAP Boot Recovery Guide' and 'SAS Cabling Guide' for steps to resolve disk detection issu
