NS0-093 Exam Dumps - NetApp Accredited Hardware Support Engineer

To analyze the provided panic error, the two sections of AutoSupport that are essential for investigation are:

What it is:HA-RASTRACE.TGZ contains HA (High Availability) system trace logs. It records hardware diagnostics, error traces, and the HA system's response to hardware events. These logs are critical when analyzing hardware-related panics, including those caused by PCI errors.

Why it's relevant to the panic:In the given panic message, the NMI (Non-Maskable Interrupt) error originates from a Qlogic FC 16G adapter. HA-RASTRACE.TGZ will provide detailed diagnostics, including the error reporting from the HA interconnect and other hardware diagnostics. Specifically, it may include information about how the system detected the PCI fault and any actions taken to protect the system state.

How to analyze:

Extract the HA-RASTRACE.TGZ file from the AutoSupport bundle.

Review hardware-related trace messages for entries associated with the PCI bus or the Qlogic FC adapter.

Look for specific error codes or keywords like PCI Error, NMI, or Qlogic.

References:

NetApp’s "AutoSupport Logs and Diagnostics Guide" highlights HA-RASTRACE.TGZ as a primary resource for debugging hardware faults.

The "Panic Troubleshooting Guide" for ONTAP systems specifies HA-RASTRACE as a key source for identifying NMI-related errors.

1. HA-RASTRACE.TGZ

What it is:SSRAM-LOG records low-level hardware error details, including PCI device register states and uncorrectable memory errors. It is particularly useful for analyzing errors originating in peripheral hardware like network or storage adapters connected via PCI.

Why it's relevant to the panic:The panic message explicitly references a PCI Error NMI caused by a Qlogic FC adapter. SSRAM-LOG captures detailed state information for PCI devices, which can help identify whether the fault originated in the adapter hardware, the PCI bus, or another related component.

How to analyze:

Extract the SSRAM-LOG from the AutoSupport bundle.

Search for PCI-related errors, including the specific error source IDs (e.g., ErrSrcID(CorrSrc(0xf00),UCorrSrc(0x18))).

Review the log entries to confirm the root cause of the NMI.

References:

The "Hardware Diagnostics and Troubleshooting Guide for ONTAP" lists SSRAM-LOG as a key file for debugging PCI errors.

NetApp’s documentation on PCI diagnostics emphasizes the use of SSRAM-LOG for validating hardware-level faults.

2. SSRAM-LOG

The Upgrade Advisor is a NetApp tool that generates a detailed, step-by-step plan for upgrading an ONTAP system. This tool is available through the Active IQ portal and helps ensure a smooth and risk-free upgrade process.

Provides a tailored upgrade plan based on the current ONTAP version, cluster configuration, and desired target version.

Identifies potential risks, compatibility issues, and pre-requisite tasks for the upgrade.

Offers detailed instructions for each stage of the upgrade process.

Key Features of Upgrade Advisor:

A. ONTAP System Manager:

While System Manager can be used to initiate upgrades, it does not generate a detailed upgrade plan.

B. Active IQ Unified Manager:

Unified Manager focuses on monitoring and management but does not provide upgrade plans.

D. Active IQ Config Advisor:

Config Advisor checks for best practices and configuration issues but is not used for generating upgrade plans.

Why Other Options Are Incorrect:

NetApp’s "ONTAP Upgrade Guide" emphasizes the use of Upgrade Advisor for planning upgrades.

Active IQ documentation provides detailed instructions on accessing and using the Upgrade Advisor tool.

References:

When a volume is deleted in a NetApp ONTAP system, it is placed in the Volume Recovery Queue. By default, the volume remains in this recovery queue for 12 hours before being permanently deleted. This allows administrators to recover mistakenly deleted volumes within the set retention period.

Explanation of Default Behavior:

Volume Recovery Queue:

This is a feature in NetApp ONTAP that acts as a safety mechanism, providing a grace period for recovering deleted volumes.

The default retention period for volumes in the recovery queue is 12 hours, as confirmed by the NetApp KB: "How to use the Volume Recovery Queue."

How to Recover a Deleted Volume:

Administrators can recover a deleted volume as long as it remains in the recovery queue and the retention period has not expired.

Use the ONTAP CLI command:

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cluster::> volume recovery-queue recover -vserver -volume

This command restores the volume back to its original state.

How to Check the Volume Recovery Queue:

To view volumes in the recovery queue and their expiration times, use:

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cluster::> volume recovery-queue show

Changing the Default Retention Period:

While the default period is 12 hours, it can be adjusted by administrators to fit specific organizational requirements. This is done via system settings or policies.

Why the Other Options Are Incorrect:

B. 48 hours: Incorrect. The default retention period is not 48 hours; it is 12 hours by default.

C. 72 hours: Incorrect. While a custom configuration could allow this, it is not the default.

D. 24 hours: Incorrect. Although this was previously thought to be the default, NetApp documentation explicitly states it is 12 hours.

References:

NetApp Knowledge Base Article: "How to use the Volume Recovery Queue".

NetApp ONTAP Documentation: Volume Recovery and Data Management Procedures.

In a clustered ONTAP system, write requests are acknowledged to the client only after they are securely stored in NVRAM on both the local node and its HA (High Availability) partner.

This ensures redundancy and data protection in case of a node failure.

Write Acknowledgment in NetApp ONTAP:

A. when the write is present in the local node RAM and NVRAM:

Writes are not acknowledged until the HA partner also stores the data in its NVRAM.

B. when the write has been flushed to disk:

Writes are acknowledged before they are written to disk, as NVRAM ensures durability.

D. when the write has been flushed from NVRAM to RAM:

Data is not acknowledged based on RAM; NVRAM on both nodes is the requirement.

Why Other Options Are Incorrect:

NetApp’s "ONTAP Write I/O Processing Guide" explains the role of NVRAM and HA in write acknowledgment.

"Data Protection in ONTAP" highlights the synchronization of NVRAM between HA partners.

References:

If the ENVIRONMENT section of the latest MANAGEMENT LOG AutoSupport message is empty, the reason can typically be found in the AUTOSUPPORT-BUDGET.XML file. This file contains information about AutoSupport resource allocation, including what sections were processed and any limits that were hit.

AUTOSUPPORT-BUDGET.XML:

This file provides a summary of the resources (budget) allocated for different AutoSupport sections.

If the ENVIRONMENT section is missing or empty, the AUTOSUPPORT-BUDGET.XML file will indicate whether it was skipped due to resource constraints or configuration limits.

Why Other Sections Do Not Apply:

B. HEADERS: This section only contains metadata about the AutoSupport message, such as timestamps and node details. It does not explain missing sections.

C. AUTOSUPPORT-HISTORY.XML: This file tracks the history of AutoSupport messages but does not provide information about missing sections.

D. MANIFEST.XML: This file lists the contents of the AutoSupport bundle but does not provide details on why a specific section is empty.

Key Details:

"ONTAP AutoSupport Troubleshooting Guide" explains the role of the AUTOSUPPORT-BUDGET.XML file in diagnosing missing or incomplete AutoSupport sections.

References:

The following ONTAP systems support both SSD and SAS disks:

Description:

The FAS2750 is part of NetApp's hybrid storage array product line.

It supports both SSDs for performance tiers and SAS disks for capacity tiers, making it suitable for mixed workloads.

1. FAS2750

Description:

The FAS8200 is an enterprise-level storage system that also supports hybrid configurations with both SSD and SAS drives.

This system is designed to handle high performance and capacity needs.

2. FAS8200

A. AFF C190:

The AFF C190 is an all-flash system and only supports SSDs. It does not support SAS disks.

C. AFF A220:

Like the AFF C190, the AFF A220 is also an all-flash system that supports SSDs only.

Why Other Options Are Incorrect:

NetApp "Hardware Universe" confirms drive support for FAS and AFF systems.

NetApp product documentation details supported disk types for hybrid and all-flash systems.

References:

When ONTAP detects a WAFL inconsistency in an aggregate, it automatically generates an AutoSupport message with the description WAFL INCONSISTENT BLOCK.

WAFL INCONSISTENT BLOCK:

This error indicates that WAFL metadata or user data blocks have been found to be inconsistent.

ONTAP triggers an automatic AutoSupport message to notify administrators and NetApp Support.

Key Details:

A. MEDIUM ERROR DURING RECONSTRUCTION:

This error occurs during disk reconstruction, not due to WAFL inconsistencies.

B. CHECKSUM ERROR:

A checksum error indicates a disk-level data integrity issue, not a WAFL inconsistency.

C. WAFL INCONSISTENT USER DATA BLOCK:

While related, this is not the specific AutoSupport message triggered by ONTAP.

Why Other Options Are Incorrect:

NetApp "ONTAP WAFL Troubleshooting Guide" describes AutoSupport messages related to WAFL inconsistencies.

References:

ï‚· RAID-TEC Overview:

RAID-TEC (Triple Erasure Coding) is a NetApp RAID technology designed to protect against up to three simultaneous disk failures.

It is ideal for systems with high-density disks or workloads requiring extreme fault tolerance.

ï‚· Why RAID-TEC Is Correct:

RAID-TEC uses triple-parity protection, which provides redundancy against three disk failures, making it more resilient than RAID-DP or RAID 5.

RAID-DP only protects against two disk failures, while RAID 4 and RAID 5 protect against a single failure.

ï‚· NetApp Reference Documentation:

"NetApp RAID and Data Protection Guide" details the differences between RAID-DP and RAID-TEC, highlighting RAID-TEC's ability to tolerate three failures.