Pass the Netapp Certified Data Administrator (NCDA) NS0-162 Questions and answers with CertsForce

When you perform an upgrade using ONTAP System Manager 9.8, you can use the automated nondisruptive update (ANDU) feature, which simplifies and streamlines the update process. The latest available images will appear in the ONTAP System Manager interface, and you can select the image you want to install. The update history is available within the ONTAP System Manager interface, and you can view the status and progress of the update. You do not need to manually upload the images to the cluster or download them from the NetApp Support site, as ONTAP System Manager will automatically download and upload the images as needed. References :- Automated nondisruptive ONTAP upgrade, How to Upgrade to ONTAP 9.8

Active IQ and ONTAP AutoSupport are the two NetApp components that satisfy the requirements. Active IQ is a cloud-based platform that uses telemetry data from NetApp products to provide insights, analytics, and recommendations for optimizing performance, availability, security, and efficiency. ONTAP AutoSupport is a feature that enables ONTAP systems to automatically send configuration, status, performance, and system events data to NetApp. This data helps NetApp to provide proactive support, identify security risks, notify bug fixes, and suggest ONTAP updates. Active IQ and ONTAP AutoSupport work together to enable automatic support case creation and resolution in case of hardware failures. References :- Security and privacy of NetApp telemetry data, Detect Security Vulnerability, Enable AutoSupport to get more insights and analytics for your StorageGRID system

The exhibit shows the details of VOL_A volume, including its IOPS allocations. The “Peak IOPS Allocation” is listed as “used-space,” and the “Expected IOPS” is 1000IOPS/TB. Since the size of VOL_A is 100GB (or 0.1TB), the expected IOPS would be 100, but it’s essential to consider that the “Absolute Minimum IOPS” is stated as 500IOPS/TB. However, since there’s no provided maximum limit in the exhibit, we can’t definitively state a maximum possible IOPS from this information alone. References :-The answer and explanation are inferred from the provided image as there’s no direct reference available in NetApp Data Administrator (ONTAP) documents and learning resources.

 The broadcast-domain split command allows you to create a new broadcast domain by moving one or more ports from an existing broadcast domain to the new one. In this scenario, you can use this command to move the e0e and e0c ports from the Default broadcast domain to a new broadcast domain in the same IPspace. This would satisfy the requirement of creating a new broadcast domain with the specified ports. The other options are not valid for this scenario, as they either create a new broadcast domain without moving any ports (A), merge two existing broadcast domains into one (D), or require a graphical user interface ©. References :- network port broadcast-domain split, Create a broadcast domain

 The correct way to warm the cache before clients access the cache volume for the first time is to prepopulate the cache volume with data from the origin volume using the flexcache prepopulate start command. This command copies the data blocks from the origin volume to the cache volume in the background, without affecting the client access to the origin volume. The other options are not valid for this scenario because:

Enabling block-level invalidation using the volume flexcache origin config modify command does not warm the cache, but rather allows the origin volume to invalidate the cached data blocks when they are modified or deleted.

Copying the data from the origin volume to the cache volume with the NetApp XCP Migration Tool is not recommended, as it can cause data inconsistency and performance degradation. XCP is a data migration tool that can copy data between different types of volumes, such as FlexVol and FlexGroup, but not between FlexCache and origin volumes.

Synchronizing the origin and cache first with the volume flexcache sync-properties command does not warm the cache, but rather ensures that the cache volume inherits the properties of the origin volume, such as size, security style, and export policy. References :- Prepopulate a FlexCache volume, FlexCache volume concepts, FlexCache volume best practices

The space guarantee setting determines how much space is reserved in the aggregate for the volume. A space guarantee of “none” means that no space is reserved for the volume, and the volume can use any available space in the aggregate. This approach to space management is called thin provisioning. This setting would prevent the hosting aggregates from showing a decrease in available space when creating new volumes, as long as the aggregate is not overcommitted. References :- How volume guarantees work with FlexVol volumes, How you set space guarantees for new or existing volumes, What is the impact of changing volume space-guarantee from “volume” to “none”?

 Quorum is a measure of cluster health and function that indicates how clusters address potential communications and connectivity issues. Quorum is maintained by a simple majority of nodes that are healthy and can communicate with each other. In a 4-node cluster, there is a possibility of a tie in the number of nodes that can communicate with each other. To avoid this, one node has an extra fractional voting weight called epsilon. Epsilon is a tie breaker that helps the cluster decide which node will maintain the master copy of the replicated databases (RDB). The node with epsilon will always be part of the quorum, unless it is unhealthy or isolated. References :- About quorum and epsilon, What is Cluster HA and how is Epsilon utilized to maintain RDB Quorum?

When a LUN has space reservations disabled (a non-space-reserved LUN), and its containing volume has no space guarantee, ONTAP reports the volume usage based on the actual data written to the LUN, not the LUN size. Therefore, ONTAP reports that the volume is using 10 GB of its containing aggregate, and the volume is 10% full. References :- Understanding space reservations for LUNs in System Manager, Recommended volume and file or LUN configuration combinations overview

To deploy a 2-node ONTAP Select cluster with synchronous mirroring and high availability, you need to take the following two steps:

Ensure that the ONTAP Select Deploy VM resides at a third location other than the two data centers. This is because the Deploy VM includes a mediator service that connects to each node in the active two-node clusters to monitor the HA pairs and assist in managing failures. The mediator service maintains the HA state information at a dedicated iSCSI target associated with each two-node cluster. If the Deploy VM is halted or fails, the mediator service is unavailable and HA capability is lost for the two-node clusters1.

Use ONTAP Mediator service to make sure that you have a quorum for the two nodes. When a cluster consists of two nodes, it is not possible to achieve the quorum required when a node fails or loses communication. To resolve these types of split-brain situations, the mediator service helps the surviving node to determine whether it should take over the partner node or halt itself1.

You do not need to install the SnapMirror Sync license on the cluster, as it is not required for synchronous mirroring. You can use the SnapMirror Synchronous (SM-S) feature, which is included in the ONTAP Select Premium license, to create a zero-recovery point objective (RPO) mirror relationship between two volumes on different clusters2.

You do not need to use ONTAP Select Deploy to install the nodes on the physical hardware, as ONTAP Select is a software-defined storage solution that runs on VMware ESXi hosts. You can use ONTAP Select Deploy to create and manage ONTAP Select clusters and nodes on the virtualized hardware3. References :- ONTAP Select two-node clusters with HA, SnapMirror Synchronous overview, Deploy an ONTAP Select cluster using the CLI.

The security method that would be used to authenticate targets and initiators in an ISCSI environment is CHAP. CHAP stands for Challenge Handshake Authentication Protocol, and it is a method that validates the identity of targets and initiators during the initial link. CHAP uses a shared secret (a password) that is exchanged between the target and the initiator in a challenge-response manner. CHAP can be used in both one-way and mutual modes, depending on whether both parties need to authenticate each other or not. The other options are not valid for this scenario because:

NIS is a network information service that provides centralized management of user accounts and host names, but it does not provide authentication for ISCSI devices.

LDAP is a protocol for accessing and managing directory services, such as user and group information, but it does not provide authentication for ISCSI devices.

/etc/hosts is a file that maps host names to IP addresses, but it does not provide authentication for ISCSI devices. References :- How iSCSI authentication works, Securing iSCSI Devices, Configure iSCSI authentication