NS0-162 Dumps with Practice Exam Questions Answers

The correct action to solve the problem is to update the Selective LUN Map configuration for the LUN mapping. Selective LUN Map (SLM) is a feature that enables you to control which LUNs are visible to which hosts in an ONTAP cluster. SLM reduces the number of paths that are presented to the host and improves the performance and manageability of the SAN environment1. When you perform a volume move, the LUN mapping is automatically updated to include the new node as a destination node, but the old node remains as a source node until the move is completed. This causes ALUA to see twice the number of paths to the LUN, as both nodes are active for the LUN. To avoid this, you need to update the SLM configuration to remove the source node from the LUN mapping after the volume move is done2. Changing the MPIO policy on the host, ensuring that the fabric zoning is correct, or rebooting the host are not actions that would solve the problem, as they do not affect the LUN mapping or the ALUA state. References :- Selective LUN Map overview, How to use Selective LUN Map (SLM) with Volume Move

 FabricPool is a feature of ONTAP that allows you to tier cold data from a local tier (aggregate) to a capacity tier (object storage) in the cloud or on-premises. ONTAP 9.8 supports four types of capacity tiers: AWS S3, Azure Blob, Google Cloud Storage, and ONTAP S3. StorageGRID is a NetApp product that provides on-premises S3 object storage. Therefore, both StorageGRID and ONTAP S3 are supported as capacity tiers for FabricPool aggregates in ONTAP 9.8. SWIFT Object Store and NFS Export are not supported as capacity tiers for FabricPool aggregates. References :- Considerations and requirements for using FabricPool, Storage Efficiencies, FabricPool with StorageGRID Recommendation Guide

 The problem is that the NFS export policy only allows access to the IP range of 192.168.10.11-12, which does not include HOST 3’s IP address of 192.168.10.13. Therefore, the ESXi host cannot mount the NFS datastore. To solve the problem, you need to add HOST 3’s IP address to the NFS export policy, or modify the IP range to include it. This will grant the ESXi host the permission to access the NFS datastore. References :- ONTAP 9 Network Management Guide, ONTAP 9 NFS Reference, Troubleshooting NFS datastore connectivity issues (1003967)

To find out which two storage efficiencies are enabled by default on NetApp AFF systems, you need to look at the documentation that explains the inline storage efficiency enablement on AFF systems. According to this document1, the following storage efficiency features are enabled by default on all newly created volumes on AFF systems:

• Inline compression: This feature reduces the amount of data written to disk by compressing data blocks before they are written to disk. Compression can reduce the storage space required by up to 50% or more, depending on the data type and compressibility.
• Inline deduplication: This feature eliminates duplicate data blocks within a volume before they are written to disk. Deduplication can reduce the storage space required by up to 90% or more, depending on the data type and similarity.
• You do not need to enable postprocess compaction or postprocess zero block detection on AFF systems, as they are not supported or required for SSDs. Postprocess compaction is a feature that combines multiple small data blocks into a single larger block after they are written to disk, which can reduce the storage space required by up to 30% or more. However, this feature is only supported for HDDs, as SSDs do not have the same physical limitations as HDDs. Postprocess zero block detection is a feature that identifies and removes blocks that contain only zeros after they are written to disk, which can reduce the storage space required by up to 10% or more. However, this feature is not required for SSDs, as inline zero block detection is already enabled by default on AFF systems23. References :- Inline storage efficiency enabled by default on AFF systems, Postprocess compaction, Zero block detection.

 NAS vol1 will shrink in size when the volume is 40% full. This is because the volume autosize mode is set to grow_shrink, which means that the volume will automatically grow or shrink based on the space usage and the specified thresholds. The shrink threshold is set to 60%, which means that the volume will start shrinking when the space usage falls below 60%. However, the volume will not shrink immediately, but will wait for a period of time (by default, 24 hours) to avoid frequent resizing. The volume will shrink to the minimum size that is required to accommodate the current data plus 10% free space, or the minimum size specified by the user, whichever is larger1. In this case, the minimum size is not specified, so the volume will shrink to the size that has 10% free space. Therefore, the volume will shrink when the space usage is 40%,as that is the point where the volume has 10% free space after shrinking. References :- Configure volumes to automatically grow and shrink their size