Dell D-UN-DY-23 Online Practice Questions and Exam Preparation

Dell D-UN-DY-23 Online Questions & Answers

• Question 1:

  Which feature can be configured for a Dell Unity XT file system NFS share?

  A. Access-Based Enumeration
  B. Protocol Encryption
  C. Host Access Level
  D. Distributed File System
  C. Host Access Level

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  explanation:

  Explanation/Reference:

  A feature that can be configured for a Dell Unity XT file system NFS share is the Host Access Level. This feature allows the user to specify the access permissions for each host or host group that is allowed to access the NFS share. The access permissions can be set to Read/Write, Read Only, or No Access. The Host Access Level feature can be used to control the security and performance of the NFS share. Access-Based Enumeration, Protocol Encryption, and Distributed File System are features that can be configured for a Dell Unity XT file system SMB share, not NFS share. References: [Dell EMC Unity: File System Configuration], [Dell EMC Unity: SMB Share Configuration]

• Question 2:

  Which snapshot option is set automatically when a Pool is configured?

  A. Total Pool Consumption
  B. Pool Automatic Deletion Policy
  C. Snapshot Pool Consumption
  B. Pool Automatic Deletion Policy

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  explanation:

  Explanation/Reference:

  The snapshot option that is set automatically when a pool is configured is the Pool Automatic Deletion Policy. This option determines how the system handles the deletion of snapshots when the pool reaches a certain threshold of capacity

  utilization. The user can choose between three policies: Never Delete, Delete Oldest, or Delete LowestPriority. The Total Pool Consumption and the Snapshot Pool Consumption are not snapshot options, but rather metrics that show the

  amount of pool space consumed by the pool data and the snapshots respectively.

  References: [Dell EMC Unity: Storage Pools and RAID Groups], [Dell EMC Unity:

  Snapshots and Thin Clones]

• Question 3:

  A storage administrator recently disabled the Advanced Deduplication on a LUN.

  Which Dell Unity XT action can be used to remove the Advanced Deduplication savings from LUN?

  A. Unmask the LUNfrom host.
  B. Perform Local LUN Move.
  C. Chanqe Tierinq Policy to Auto-Tier.
  D. Disable the Data Reduction.
  B. Perform Local LUN Move.

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  explanation:

  Explanation/Reference:

  When Advanced Deduplication is disabled on a LUN, the existing data that was deduplicated remains in its reduced state, and only new data written to the LUN is not deduplicated. To remove the Advanced Deduplication savings from the LUN, the administrator must perform a Local LUN Move operation, which copies the data from the source LUN to a destination LUN without deduplication. The destination LUN must have Advanced Deduplication disabled, and must be in the same storage pool as the source LUN. After the Local LUN Move is completed, the source LUN can be deleted and the destination LUN can be renamed as the original LUN. References: Dell Unity: Data Reduction2, page 9.

• Question 4:

  Multiple I/O modules must be installed in Dell Unity XT 680 storage.

  Which module must be installed in slot 0?

  A. 4-Port 25 Gbps Ethernet
  B. 4-Port 16 Gb Fibre Channel
  C. 4-Port 10 Gbps Ethernet
  D. 12 Gb/s SAS back-end
  D. 12 Gb/s SAS back-end

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  explanation:

  Explanation/Reference:

  The Unity XT 680 system supports four types of I/O modules: 12 Gb/s SAS back-end, 4-Port 16 Gb Fibre Channel, 4-Port 25 Gbps Ethernet, and 4-Port 10 Gbps Ethernet. The 12 Gb/s SAS back-end module provides connectivity to the disk drives and expansion enclosures, while the other three types of modules provide network connectivity to the hosts and clients. The Unity XT 680 system has six I/O module slots, three for each SP. The 12 Gb/s SAS back-end module must be installed in slot 0 of each SP, and the other modules can be installed in slots 1 and 2 of each SP. Therefore, the correct answer is D. 12 Gb/s SAS back-end. References: Dell EMC Unity XT: Hardware Information Guide Dell EMC Unity XT: Installation Guide

• Question 5:

  Which two actions are recommended according to best practices when connecting iSCSI host to a Dell Unity XT system? (Choose two.)

  A. Manually register host on storage array.
  B. Use standard NIC for iSCSI.
  C. Interfaces should be on separate subnets.
  D. Use private network for iSCSI interfaces.
  C. Interfaces should be on separate subnets.
  D. Use private network for iSCSI interfaces.

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  explanation:

  Explanation/Reference:

  Two actions that are recommended according to best practices when connecting iSCSI host to a Dell Unity XT system are to ensure that the interfaces are on separate subnets and to use a private network for iSCSI interfaces. These actions can improve the performance, security, and availability of the iSCSI network. Having interfaces on separate subnets can prevent broadcast storms, reduce network congestion, and enable multipathing. Using a private network for iSCSI interfaces can isolate the iSCSI traffic from other network traffic, reduce the risk of interference or attacks, and simplify the network configuration. Manually registering host on storage array and using standard NIC for iSCSI are not recommended actions, as they can introduce errors, inefficiencies, and limitations. References: [Dell EMC Unity: iSCSI Configuration], [Dell EMC Unity: Best Practices Guide]

• Question 6:

  What is the maximum size of a drive partnership group when expanding a Dynamic Pool?

  A. 64 drives
  B. 84 drives
  C. 96 drives
  D. 32 drives
  D. 32 drives

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  explanation:

  Explanation/Reference:

  A drive partnership group is a collection of drives of the same drive type that have been combined into a hidden dynamic pool object. Each drive within a dynamic pool can only be part of a single drive partnership group, and a drive will never change the drive partnership group. The maximum size of a drive partnership group is 32 drives, regardless of the drive type or size. When expanding a dynamic pool, the system will automatically create new drive partnership groups as needed, and distribute the drives evenly across the groups. The number of drive partnership groups in a dynamic pool is equal to the number of drives divided by 32, rounded up to the nearest integer. References: Dell Unity: Dynamic Pools2, page 5.

• Question 7:

  What is the maximum number of drives on a traditional RAID Group?

  A. 64 drives
  B. 16 drives
  C. 8 drives
  D. 32 drives
  B. 16 drives

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  explanation:

  Explanation/Reference:

• Question 8:

  A storage administrator has a Dell Unity XT 480 system with one pool of flash drives, 192 GB of RAM, and 1.2 TB of FAST Cache.

  What is the total cache availability for caching the flash drives?

  A. 3.2 TB
  B. 1.39 TB
  C. 3.58 TB
  D. I6.0 TB
  C. 3.58 TB

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  explanation:

  Explanation/Reference:

  The total cache availability for caching the flash drives on a Dell Unity XT 480 system with one pool of flash drives, 192 GB of RAM, and 1.2 TB of FAST Cache is 3.58 TB. This is calculated by adding the system memory (RAM), the FAST Cache, and the pool cache. The system memory is 192 GB, which is equivalent to 0.18 TB. The FAST Cache is 1.2 TB, which is a dedicated cache for the flash drives. The pool cache is 2.2 TB, which is a portion of the flash drives that is reserved for caching the pool data. Therefore, the total cache availability is 0.18 + 1.2 + 2.2 = 3.58 TB. References: [Dell EMC Unity: Performance Metrics], [Dell EMC Unity: FAST Cache Overview]

• Question 9:

  Which is the preferred FC Port for synchronous replication for a Dell Unity XT 380 system?

  A. Fibre Channel Port 0 of I/O module 0
  B. Fibre Channel Port 4 of SPA and SPB www*
  C. Port 0 of I/O module 1
  D. Port 1 of I/O module 0
  B. Fibre Channel Port 4 of SPA and SPB www*

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  explanation:

  Explanation/Reference:

  The preferred FC Port for synchronous replication for a Dell Unity XT 380 system is Fibre Channel Port 4 of SPA and SPB. This port is dedicated for synchronous replication traffic and has the highest priority and bandwidth allocation. Synchronous replication is a method of replicating data between two Dell Unity systems with zero recovery point objective (RPO). It requires a low-latency and high-bandwidth network connection between the source and destination systems. References: [Dell EMC Unity: Replication Technologies], [Dell EMC Unity: Hardware Information Guide]

• Question 10:

  What is the result of enabling Data Reduction on a LUN in a consistency group containing three LUNs?

  A. Any writes to the LUN will go through the Data Reduction logic.
  B. Data Reduction and Advanced Deduplication will be enabled on all LUNs.
  C. Data Reduction will be enabled on all LUNs is the consistency group.
  D. All writes to all consistency group LUNs will go through the Data Reduction logic.
  D. All writes to all consistency group LUNs will go through the Data Reduction logic.

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  explanation:

  Explanation/Reference:

  Data Reduction is a feature that reduces the amount of physical storage space required to store user data on a LUN. Data Reduction is enabled at the LUN level and applies to all the data in the LUN, including snapshots and thin clones. Data Reduction consists of two components: compression and deduplication. Compression reduces the size of data blocks by removing redundant information, while deduplication eliminates duplicate blocks across the LUN. When Data Reduction is enabled on a LUN, all writes to the LUN will go through the Data Reduction logic before being written to the storage pool. If the LUN is part of a consistency group, Data Reduction will be enabled on all the LUNs in the consistency group, and all writes to any LUN in the group will go through the Data Reduction logic. This ensures that the data in the consistency group is consistent and protected by the same Data Reduction settings. References: Dell EMC Unity: Data Reduction Overview Dell EMC Unity: Data Reduction Configuration and Best Practices