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NetApp NS0-593 Exam - Topic 1 Question 76 Discussion

The motherboard of Node-01 is being replaced. To perform this task, a takeover was Initiated from Node-02. Node-02 panics showing the string below.PANIC; Permanent errors on all HA mailbox disks (while marshalling header) in SKprocess fnmbx_instanceWorker on release 9.5P8 (C)What has happened in this situation?
D) While in maintenance mode, the mailbox destroy local command was executed.
A) While in maintenance mode, the sldiag device show command was executed.
B) While in maintenance mode, the fcadmin device_map command was executed.
C) While in maintenance mode, the HA_config show command was executed.

NetApp NS0-593 Exam - Topic 1 Question 76 Discussion

Actual exam question for NetApp's NS0-593 exam
Question #: 76
Topic #: 1
[All NS0-593 Questions]

The motherboard of Node-01 is being replaced. To perform this task, a takeover was Initiated from Node-02. Node-02 panics showing the string below.

PANIC; Permanent errors on all HA mailbox disks (while marshalling header) in SKprocess fnmbx_instanceWorker on release 9.5P8 (C)

What has happened in this situation?

Show Suggested Answer Hide Answer
Suggested Answer: D

The mailbox disks are the first two disks of the root aggregate on each node of an HA pair. They store the HA state information and the panic dump files.The mailbox disks are used for communication between the HA partners and for takeover and giveback operations1

The mailbox destroy local command is used to destroy the mailbox disks on the local node. This command is only available in maintenance mode and should be used with extreme caution.The command is intended for situations where the mailbox disks are corrupted or inaccessible and need to be recreated2

If the mailbox destroy local command is executed on a node that is in takeover mode, the node will panic with the message ''Permanent errors on all HA mailbox disks''.This is because the node will lose the HA state information and the panic dump files of the partner node, and will not be able to communicate with the partner node or perform a giveback operation3

Therefore, if the motherboard of Node-01 is being replaced, and a takeover was initiated from Node-02, and Node-02 panics showing the string ''Permanent errors on all HA mailbox disks'', the most likely cause is that the mailbox destroy local command was executed on Node-02 while in maintenance mode.This is a serious error that can result in data loss and system downtime4


1: ONTAP 9 - High-Availability Configuration Guide - The Open Group2: ONTAP 9 - Commands: Manual Page Reference - The Open Group3: How to troubleshoot a ''Permanent errors on all HA mailbox disks'' panic - NetApp Knowledge Base4: One node PANIC : Permanent errors on all HA mailbox disks - NetApp Knowledge Base

by Tran at Nov 19, 2025, 09:25 AM

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Evan
3 months ago
I’m not sure, but A seems plausible too. Maintenance mode can be risky.
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Luther
3 months ago
I’m with Leonida. D makes sense, especially with permanent errors.
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Keneth
3 months ago
I disagree, it's C. HA_config should be safe in maintenance mode.
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Odette
4 months ago
I lean towards B. The device_map command can mess things up.
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Carmela
4 months ago
I feel like it's A. Executing sldiag might lead to errors.
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Leonida
4 months ago
This is tricky. I think it's D. Destroying the mailbox could cause panic.
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Darrel
5 months ago
Wow, I didn't expect all disks to fail at once like that!
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Aleisha
5 months ago
Totally agree, D is the most likely culprit here.
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Gwen
5 months ago
Wait, are we sure it's not just a misconfiguration?
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Fabiola
5 months ago
I think it's definitely related to the mailbox destroy command.
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Emiko
5 months ago
Sounds like a classic panic error due to disk issues.
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Rachael
5 months ago
Haha, "while marshalling header" - that's a new one! Option C is my pick.
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Dorothy
6 months ago
Hmm, marshalling header errors, huh? Sounds like a real headache. I'm going with option C.
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Vallie
6 months ago
Whoa, permanent errors on all HA mailbox disks? That's not good. I'd say option C is the way to go.
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Emile
6 months ago
Looks like a classic HA mailbox issue. I'd go with option C on this one.
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Clemencia
6 months ago
Ah, I see what's going on here. The error message indicates there were permanent errors on the HA mailbox disks during the takeover process. Based on that, I think the correct answer is option D - the mailbox destroy local command was executed while in maintenance mode, which led to the issues.
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Emerson
6 months ago
Yikes, this is a tricky one. The error message mentions issues with the HA mailbox disks, so I'm thinking it's probably related to one of the maintenance mode commands. I'll need to carefully consider each option and try to figure out which one is the most likely cause of the problem.
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Whitney
6 months ago
Okay, this error message is pretty clear. It looks like there were permanent errors on the HA mailbox disks while marshalling the header in the SKprocess fnmbx_instanceWorker. Based on that, I think the most likely answer is option C - the HA_config show command was executed while in maintenance mode, which caused the problem.
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Norah
7 months ago
This reminds me of a practice question where we discussed the implications of running commands in maintenance mode. I feel like the fcadmin command might be the culprit here.
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Frederick
7 months ago
I’m not entirely sure, but I think the mailbox destroy local command could lead to permanent errors if it was executed incorrectly.
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Kristel
7 months ago
I remember something about the HA mailbox disks being crucial for high availability, so this panic might relate to a command that affects those disks.
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Carrol
8 months ago
I’m a bit confused about the options, but I think the sldiag command is more for diagnostics, not something that would cause a panic like this.
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Lashanda
8 months ago
Hmm, this looks like a problem with the HA mailbox disks during the takeover process. I'm guessing one of the maintenance mode commands like HA_config show or mailbox destroy local might have caused the issue. I'll need to carefully read through the options and try to identify the most likely culprit.
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Carman
8 months ago
I'm a bit confused by this error message. It seems to be related to high availability (HA) mailbox disks, but I'm not sure which specific command caused the issue. I'll need to review the HA configuration and maintenance mode commands more closely.
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Paris
2 months ago
Reviewing the HA configuration sounds like a good plan.
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Alton
3 months ago
I think it might be the fcadmin device_map command.
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Maynard
3 months ago
Could it be the mailbox destroy local command?
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Kathrine
3 months ago
Yeah, I wonder which command triggered the panic.
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German
7 months ago
That error looks serious. It’s definitely related to HA mailbox disks.
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