Most Recent NetApp NS0-093 Exam Questions & Answers

To view information about installed Field Replaceable Units (FRUs) using the Service Processor, the following commands are used:

1. system fru list

What it does: Displays a list of all installed FRUs, such as disks, power supplies, and fans.

Example Usage:

system fru list

2. system fru show

What it does: Provides detailed information about specific FRUs, including serial numbers, statuses, and hardware details.

system fru show

Why Other Options Are Incorrect:

C . system sensors show:

This command displays sensor data (e.g., temperature, voltage) but does not list FRUs.

D . system power status:

This command shows power supply status but does not provide FRU details.

'Service Processor Commands Guide' from NetApp provides a comprehensive overview of system fru list and system fru show.

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

Key Details:

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.

Why Other Options Are Incorrect:

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.

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

To manually generate a kernel core file in ONTAP, the following commands can be used:

1. ::> reboot --node <node_name> --dump true

What it does: Reboots the specified node and generates a core dump before rebooting.

Example Usage:

reboot --node <node_name> --dump true

2. ::> halt --dump true --node <node_name>

What it does: Halts the specified node and generates a core dump before shutting down.

Example Usage:

halt --dump true --node <node_name>

3. ::> system node panic --node <node_name>

What it does: Forces a panic on the specified node, which triggers a kernel core dump.

Example Usage:

system node panic --node <node_name>

Why Other Options Are Incorrect:

A . SP> system power cycle:

This command reboots the system from the Service Processor but does not generate a core dump.

NetApp 'Kernel Core Dump Guide' explains the use of reboot, halt, and panic commands to trigger core dumps.

ONTAP CLI Reference includes the syntax for these commands.

In a NetApp high-availability (HA) configuration, multipath HA ensures redundancy by providing two independent paths from each controller to the connected storage. If the system is currently showing Single-Path HA, it means only one path is operational or connected, which is a potential single point of failure.

To convert the configuration to multipath HA, additional cabling must be configured to establish the second path. For the AFF A220 system, the correct connections are as follows:

Explanation of the Correct Answer :

AFF A220 Port Configuration for HA:

Each controller in an AFF A220 has ports labeled 0a, 0b, 0c, and 0d for connectivity.

In a multipath HA configuration, each controller must have two independent paths to the connected storage via the partner controller's disk shelves.

Correct Cabling for Multipath HA:

Port 0a on both controllers must be connected to the corresponding port (e.g., disk shelf stack or Inter-Switch Link).

Port 0c on both controllers must also be connected to complete the redundant path.

These connections ensure that there are two independent data paths between the controllers and the storage system, providing fault tolerance in case one path fails.

Single-Path HA to Multipath HA:

If the system currently shows Single-Path HA, it is likely that only one set of ports (e.g., 0a and 0b) are cabled.

Adding the additional connections on 0a and 0c establishes the second path required for multipath HA.

Why the Other Options Are Incorrect:

A . 0a and 0b on both controllers should be connected:

This option only connects ports 0a and 0b, which does not establish a multipath HA configuration. Port 0c is also required for redundancy.

C . 0c and 0d on both controllers should be connected:

Connecting only 0c and 0d would leave ports 0a disconnected, failing to establish a proper multipath HA setup. Both 0a and 0c are required.

D . 0a and 0d on both controllers should be connected:

Connecting 0a and 0d is not the standard configuration for multipath HA in an AFF A220 system. Port 0c is part of the required configuration.

How to Verify the Configuration:

Use the following ONTAP command to verify the HA status:

cluster::> storage failover show -fields multipath-ha

This will display whether the system is in multipath HA or single-path HA mode.

Check the port connectivity:

cluster::> network port show -node <node_name>

NetApp Hardware Installation and Setup Guide for AFF A220.

NetApp Knowledge Base: 'Configuring Multipath HA for AFF Systems.'

ONTAP 9.x System Administration Guide: 'High Availability Configurations.'

Understanding Single-Path HA vs. Multipath HA:

Single-Path HA indicates that only one path exists between the controllers and the connected shelves, leading to limited redundancy.

Multipath HA requires both controllers to have redundant SAS connections to the shelves.

Cabling for Multipath HA in AFF A220 Systems:

To achieve multipath HA, you must connect 0c and 0d on both controllers to the appropriate stack ports on the shelves.

This ensures dual paths for each controller to access the storage shelves.

NetApp Reference Documentation:

Refer to the 'ONTAP Multipath HA Configuration Guide' and the 'NetApp Hardware Installation Guide' for AFF A220 systems for cabling diagrams and best practices.

Overview of IOM 12 Module:

The IOM 12 module is used in NetApp storage shelves for SAS connectivity.

Key Features of IOM 12:

SAS Ports: The IOM 12 module has four SAS ports (two IN and two OUT) to support daisy-chaining of shelves and provide redundancy.

ACP (Alternate Control Path): The IOM 12 includes an Ethernet port for ACP, which is used for out-of-band management and monitoring of the storage shelves.

Elimination of Other Options:

Option A is incorrect because the module has four SAS ports, not two.

Option C is incorrect because the module does include an Ethernet port for ACP.

NetApp Reference Documentation:

'NetApp Hardware Universe' lists the specifications of the IOM 12 module, including its SAS and ACP capabilities.

The 'ONTAP Shelf Installation Guide' discusses ACP and its role in shelf management.