D-UN-DY-23無料試験学習ガイド！（更新された38問あります)
D-UN-DY-23問題集にはProven Professional認証済み試験問題と解答
EMC D-UN-DY-23（Dell Unity Deploy 2023）認定試験は、Dell EMC Unityストレージシステムを管理する責任を持つITプロフェッショナルにとって重要な認定試験です。この認定試験は、Dell EMC Unityストレージシステムに関連する広範なトピックをカバーしており、世界中のIT組織に認められています。この認定試験に対して準備をし、合格することで、ITプロフェッショナルはキャリアの可能性を高め、Dell EMC Unityストレージシステムの展開と管理における専門知識を証明できます。
質問 # 11
Which I/O modules does the Unity 380/380F system support?
- A. 32 Gb/s Fibre Channel
2-Port 100 GbE - B. 12 Gb/s SAS
10 GbE Base-T - C. 12 Gb/s SAS
2-Port 100 GbE - D. 32 Gb/s Fibre Channel
10 GbE Base-T
正解：B
解説：
Explanation
The Unity 380/380F system supports two types of I/O modules: 12 Gb/s SAS back-end and 10 GbE Base-T front-end. The 12 Gb/s SAS back-end module provides connectivity to the disk drives and expansion enclosures, while the 10 GbE Base-T front-end module provides network connectivity to the hosts and clients.
The Unity 380/380F system has four I/O module slots, two for each SP. The 12 Gb/s SAS back-end module must be installed in slot 0 of each SP, and the 10 GbE Base-T front-end module can be installed in slot 1 of each SP. Therefore, the correct answer is C. 12 Gb/s SAS 10 GbE Base-T. References:
Dell EMC Unity: Hardware Information Guide
Dell EMC Unity: Installation Guide
質問 # 12
What is the result of enabling Data Reduction on a LUN in a consistency group containing three LUNs?
- A. Data Reduction and Advanced Deduplication will be enabled on all LUNs.
- B. All writes to all consistency group LUNs will go through the Data Reduction logic.
- C. Data Reduction will be enabled on all LUNs is the consistency group.
- D. Any writes to the LUN will go through the Data Reduction logic.
正解：B
解説：
Explanation
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
質問 # 13
Which is the preferred FC Port for synchronous replication for a Dell Unity XT 380 system?
- A. Port 1 of I/O module 0
- B. Port 0 of I/O module 1
- C. Fibre Channel Port 4 of SPA and SPB www*
- D. Fibre Channel Port 0 of I/O module 0
正解：C
解説：
Explanation
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]
質問 # 14
What are two prerequisites when creating host configuration for NFS client? (Choose two.)
- A. Subnet access
- B. Tenant information
- C. Network Address
- D. Hostname
正解：C、D
解説：
Explanation
Host configuration is the process of defining the host properties and access permissions for a host that connects to the Dell Unity XT system. For NFS clients, the host configuration requires two prerequisites:
Network Address: The network address is the IP address or the subnet mask of the NFS client that identifies the host on the network. The network address is used to register the host on the Dell Unity XT system and to grant access to the NFS filesystems.
Hostname: The hostname is the name of the NFS client that is resolved by the DNS server or the local hosts file. The hostname is used to display the host information on the Unisphere UI and to enable host monitoring and alerting.
References:
Dell EMC Unity: Host Configuration
Dell EMC Unity: File System Configuration and Management
質問 # 15
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. Interfaces should be on separate subnets.
- C. Use private network for iSCSI interfaces.
- D. Use standard NIC for iSCSI.
正解：B、C
解説：
Explanation
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]
質問 # 16
What does the Dell Unity XT system do after a NAS server starts outbound traffic to an external service?
- A. Creates an active interface buffer cache in DRAM
- B. Uses the active production interface
- C. Uses Packet Reflect for outbound communication
- D. Selects interfaces that are based on advance static routes
正解：C
解説：
Explanation
Packet Reflect is a feature that enables the Dell Unity XT system to use the same interface for outbound communication that was used for inbound communication. This feature is useful when the Dell Unity XT system needs to initiate outbound traffic to an external service, such as DNS, NTP, LDAP, or SMTP. By using Packet Reflect, the Dell Unity XT system can avoid routing issues, firewall restrictions, or network address translation problems that may occur when using a different interface for outbound communication. When a NAS server starts outbound traffic to an external service, the Dell Unity XT system uses Packet Reflect to send the packets through the same interface that received the packets from the external service. Therefore, the correct answer is D. Uses Packet Reflect for outbound communication. References:
Dell EMC Unity: NAS Capabilities
Dell EMC Unity: Unisphere Overview
質問 # 17
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. 12 Gb/s SAS back-end
- C. 4-Port 16 Gb Fibre Channel
- D. 4-Port 10 Gbps Ethernet
正解：B
解説：
Explanation
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
質問 # 18
An administrator notices that the communications between Unisphere and the storage system get interrupted.
Which service task should the administrator perform to fix the issue with minimal impact?
- A. Reboot Storage Processor
- B. Reinitialize
C Enable SSH - C. Restart Management Software
正解：C
解説：
Explanation
The service task that the administrator should perform to fix the issue with minimal impact is Restart Management Software. This service task restarts the management software on both storage processors without affecting the data services or the host I/O. This can resolve the communication issues between Unisphere and the storage system. Reinitialize, Enable SSH, and Reboot Storage Processor are service tasks that have more impact and risk than Restart Management Software.
References: [Dell EMC Unity: Unisphere Overview], [Dell EMC Unity: Service Tasks]
質問 # 19
Which are two features of the Dell UnityVSA? (Choose two.)
- A. FC Connectivity
- B. iSCSI Connectivity
- C. Dynamic Pools
- D. Asynchronous Replication
- E. NVMe Connectivity
正解：B、D
解説：
Explanation
The Dell UnityVSA is a software-defined storage solution that runs the Dell Unity operating environment on a VMware ESXi server. The Dell UnityVSA provides the same features and functions as the Dell Unity hardware platform, such as block and file storage, snapshots, thin clones, data reduction, replication, and encryption. Some of the features of the Dell UnityVSA are:
iSCSI Connectivity: The Dell UnityVSA supports iSCSI connectivity for block storage access. The iSCSI protocol enables hosts to communicate with the DellUnityVSA over an IP network and access LUNs as SCSI devices. The Dell UnityVSA can support up to 64 iSCSI interfaces and up to 256 iSCSI sessions per interface.
Asynchronous Replication: The Dell UnityVSA supports asynchronous replication for block and file storage. Asynchronous replication is a feature that copies data from a source storage resource to a destination storage resource over a network at scheduled intervals. Asynchronous replication can be used for disaster recovery, data migration, or backup purposes. The Dell UnityVSA can support up to
256 replication sessions per system.
References:
Dell EMC Unity: Introduction to the Platform
Dell EMC Unity: Deploying VMware vSphere with Dell EMC UnityVSA
Dell EMC Unity: Configuring Hosts to Access Block Storage
Dell EMC Unity: Replication Technologies
質問 # 20
Which are two ways to create an asynchronous replication session for a NAS server? (Choose two.)
- A. Create replication connect.
- B. Use the NAS server wizard.
- C. Create replication interface.
- D. Use NAS server properties.
正解：B、D
解説：
Explanation
Two ways to create an asynchronous replication session for a NAS server are to use NAS server properties and to use the NAS server wizard. Both methods allow the user to select a source NAS server and a destination NAS server, and configure the replication settings, such as the RPO, the replication schedule, and the replication mode. Creating a replication connection or a replication interface are not ways to create an asynchronous replication session for a NAS server, but rather prerequisites for enabling replication between two Dell Unity systems.
References: [Dell EMC Unity: Replication Technologies], [Dell EMC Unity: NAS Capabilities]
質問 # 21
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. 3.58 TB
- C. I6.0 TB
- D. 1.39 TB
正解：B
解説：
Explanation
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]
質問 # 22
What is the maximum number of drives on a traditional RAID Group?
- A. 8 drives
- B. 64 drives
- C. 32 drives
- D. 16 drives
正解：D
解説：
Explanation
The maximum number of drives on a traditional RAID group depends on the RAID type and the drive type.
For RAID 5 and RAID 6, the maximum number of drives is 16 for all drive types. For RAID 1/0, the maximum number of drives is 32 for SAS and NL-SAS drives, and 16 for SSD drives. References: Dell EMC Unity: Best Practices Guide2, page 17.
質問 # 23
What is the maximum time difference allowed between the current system time (UTC) and the NTP server time during the initial configuration of a Dell Unity system?
- A. 7 min
- B. 15 min
- C. 17 min
- D. 5 min
正解：C
解説：
Explanation
If the time difference between the current system (UTC) time and the NTP server time is too large (approximately 17 minutes), the user cannot configure an NTP server during initial configuration. The user will need to adjust the time while in "Set time manually" mode before changing to "Enable NTP synchronization". This is to avoid potential issues with data replication, snapshots, and audit logs that rely on accurate time stamps. References: Dell EMC Unity: How to change System Time from 'Set time manually' option to NTP2, page 1.
質問 # 24
Which feature can be configured for a Dell Unity XT file system NFS share?
- A. Access-Based Enumeration
- B. Distributed File System
- C. Protocol Encryption
- D. Host Access Level
正解：D
解説：
Explanation
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]
質問 # 25
Which disk format is recommended when deploying Dell UnityVSA OVA?
- A. Thick Provision Lazy Zeroed
- B. Thick Provision Eager Zeroed
- C. Thin Provision
正解：B
解説：
Explanation
When deploying Dell UnityVSA OVA, the recommended disk format is Thick Provision Eager Zeroed, which allocates and zeroes out all the space for the virtual disks at the time of creation. This ensures better performance and avoids potential issues with thin provisioning on the underlying storage. Thin Provision and Thick Provision Lazy Zeroed are not recommended, as they may cause performance degradation and unexpected out-of-space errors.
References: [Dell EMC UnityVSA Installation Guide], [Dell EMC UnityVSA Best Practices Guide]
質問 # 26
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