Netapp NS0-516 - NetApp Certified Implementation Engineer - SAN Specialist - E-Series

ï‚·Purpose: To display the average latency time on a per LUN basis.

ï‚·Command:lun stats -i 5

Usage: Provides performance statistics, including latency, for each LUN at specified intervals (every 5 seconds in this case).

ï‚·References: NetApp Data ONTAP Command Reference Guide.

Identify the Orphaned Volume:

Step:Use SANtricity System Manager to identify the orphaned volume.

Reason:To determine which volume has lost its mirror relationship.

Remove the Mirroring Relationship:

Step:Access the mirroring settings for the orphaned volume and remove the existing relationship.

Reason:The current relationship is invalid and needs to be removed to reset the configuration.

Re-create the Mirroring Relationship:

Step:Establish a new mirroring relationship for the previously orphaned volume.

Reason:To restore the asynchronous mirroring setup with a valid configuration.

References:

NetApp SANtricity System Manager User Guide

NetApp Asynchronous Mirroring Best Practices Guide

ï‚·The multipath configuration file for Fibre Channel (FC) on Linux systems is typically/etc/multipath.conf.

ï‚·This file is used to define multipath settings and policies, such as path grouping, path selection, and failover behavior.

ï‚·References: NetApp E-Series SANtricity Multipath Drivers Guide for Linux.

Understanding Load Distribution: In a duplex E-Series system, load distribution between controllers can be manually set up to optimize performance based on specific workload characteristics.

Automatic Load Balancing: This feature automatically redistributes workloads between controllers to balance the load. However, in a highly tuned environment with manually configured load distribution, this automatic feature can disrupt the optimized settings.

Disabling Automatic Load Balancing: To maintain the manual load distribution over time, the Automatic Load Balancing feature should be disabled. This ensures that the workload remains distributed according to the specific manual configuration without interference from automatic adjustments.

References:

NetApp E-Series SANtricity System Manager documentation

NetApp Implementation Engineer - SAN Specialist - E-Series manuals

In a Dynamic Disk Pool (DDP), the system is designed to handle drive failures efficiently without impacting data availability. When a drive fails within a DDP and there is no free capacity, the data from the failed drive is rebuilt using preservation capacity within the DDP.

Dynamic Disk Pools use distributed sparing, which allows the spare capacity to be spread across all the drives in the pool rather than relying on dedicated hot spare drives. This distribution ensures that the rebuild process starts immediately and can be completed faster than traditional RAID systems because the workload is shared across more drives.

The preservation capacity is essentially reserved space within the DDP that can be utilized in the event of a drive failure to rebuild the data. This approach helps in maintaining redundancy and protecting data integrity even when a drive fails.

References:

NetApp E-Series Storage System Documentation

SANtricity System Manager User Guide

ï‚·Exhibit Analysis: The exhibit shows the rear view of an E-Series controller with various ports.

ï‚·SAS expansion ports: 2 ports (EXP1 and EXP2).

ï‚·SAS host ports: 6 ports.

ï‚·FC/iSCSI ports: 2 ports (these ports can be configured as either FC or iSCSI).

ï‚·References: NetApp E-Series hardware manual and port configuration guides.

When completing a Certificate Signing Request (CSR) for an E-Series system, you will need:

The controller’s geographical location: This is typically the city or locality and the country where the controller is located.

The controller’s common name: This is usually the fully qualified domain name (FQDN) of the controller.

The controller’s alternate names: These may include additional domain names or IP addresses that the certificate should also cover.

CHAP (Challenge Handshake Authentication Protocol): CHAP is a protocol used to authenticate the identity of an initiator or target in iSCSI communications. This ensures that only authorized devices can connect to the storage array over the iSCSI network.

Implementation in E-Series: In the context of E-Series systems, CHAP secrets are configured to provide an additional layer of security by requiring both the initiator and target to authenticate each other using a shared secret before establishing an iSCSI session.

References:

NetApp E-Series SANtricity System Manager documentation on iSCSI setup

NetApp Implementation Engineer - SAN Specialist - E-Series manuals

Explanation:

Data integrity issues can often be prevented by ensuring that mechanisms for data assurance and media scanning are activated.

Data Assurance (DA) is a feature that verifies the integrity of the data as it is read from or written to the storage system, detecting and correcting errors.

Media scan is a background process that checks the entire disk surface for errors and corrects any found before they cause data integrity issues.

Together, these features ensure ongoing data integrity by preemptively identifying and fixing potential issues.