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Dell Unityストレージシステムは、幅広いアプリケーションに使用できる強力で柔軟なストレージソリューションです。このシステムは、高いパフォーマンス、拡張性、信頼性を提供するように設計されており、あらゆるサイズの組織にとって理想的な選択肢です。EMC D-UN-DY-23認定試験は、個人のシステムに関する知識を検証し、効果的に展開、設定、および維持するために必要なスキルを保証するように設計されています。
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. Selects interfaces that are based on advance static routes
- D. Uses Packet Reflect for outbound communication
正解：D
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
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 # 18
A system administrator deployed a UnityVSA to their vSphere environment. They did not add the management IP to the UnityVSA during the installation.
Which command must be used to apply the management IP from the vSphere UnityVSA console?
- A. svc_initial_config
- B. svc_ipmi
- C. svc_inject
- D. svc_change_hw_config
正解：A
解説：
Explanation
To apply the management IP from the vSphere UnityVSA console, the system administrator must use the svc_initial_config command. This command allows the user to configure the initial network settings for the UnityVSA, such as the management IP address, subnet mask, gateway, and DNS servers. The svc_ipmi command is used to configure the IPMI settings for the UnityVSA, such as the IPMI IP address, username, and password. The svc_change_hw_config command is used to change the hardware configuration of the UnityVSA, such as the number of CPU cores, memory size, and disk size. The svc_inject command is used to inject faults into the UnityVSA for testing purposes.
References: [Dell EMC UnityVSA Installation Guide], [Dell EMC UnityVSA Command Line Interface Reference Guide]
質問 # 19
Multiple I/O modules must be installed in Dell Unity XT 680 storage.
Which module must be installed in slot 0?
- A. 4-Port 10 Gbps Ethernet
- B. 12 Gb/s SAS back-end
- C. 4-Port 25 Gbps Ethernet
- D. 4-Port 16 Gb Fibre Channel
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 # 20
On a Dell Unity XT file system asynchronous replication session, how many system Snapshots are required to support replication?
- A. 0
- B. 1
- C. 2
- D. 3
正解：D
解説：
Explanation
On a Dell Unity XT file system asynchronous replication session, four system Snapshots are required to support replication. Two system Snapshots are created on the source file system, and two system Snapshots are created on the destination file system. The source system Snapshots are used to track the changes that need to be replicated, and the destination system Snapshots are used to apply the changes and maintain a consistent point-in-time copy of the source data. The system Snapshots are automatically created and managed by the replication engine and are not visible to the user.
References: [Dell EMC Unity: Replication Technologies], [Dell EMC Unity: File System Configuration]
質問 # 21
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. Restart Management Software
- B. Reboot Storage Processor
- C. Reinitialize
C Enable SSH
正解：A
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 # 22
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. 5 min
- B. 15 min
- C. 17 min
- D. 7 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 # 23
What are two prerequisites when creating host configuration for NFS client? (Choose two.)
- A. Subnet access
- B. Network Address
- C. Hostname
- D. Tenant information
正解：B、C
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 # 24
What is the maximum number of drives on a traditional RAID Group?
- A. 32 drives
- B. 16 drives
- C. 8 drives
- D. 64 drives
正解：B
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 # 25
What is the purpose of a Proxy NAS server?
- A. Access snapshots for testing production NAS servers.
- B. Increase performance for shared network connections that access NAS servers.
- C. Access snapshot replicas on the destination side of a replicated file resource.
- D. Increase security of production NAS servers.
正解：C
解説：
Explanation
The purpose of a Proxy NAS server is to access snapshot replicas on the destination side of a replicated file resource. A Proxy NAS server is a temporary NAS server that is created on the destination system to mount a snapshot replica of a replicated file system. This allows the user to access the data on the snapshot replica for testing, recovery, or other purposes. A Proxy NAS server does not increase performance or security of production NAS servers, nor does it access snapshots for testing production NAS servers.
References: [Dell EMC Unity: Replication Technologies], [Dell EMC Unity: File System Configuration]
質問 # 26
What is a characteristic of Host Groups?
- A. Block storage resources addedlo a host group are accessible to all the member hosts
- B. Hosts added to a host group must not have mapped block storage resources.
- C. Block storage resources attached to one of the member hosts are accessible to the entire host group.
- D. Access to block storage resources must be set before adding hosts to a host group.
正解：A
解説：
Explanation
A characteristic of Host Groups is that block storage resources added to a host group are accessible to all the member hosts. A Host Group is a logical grouping of hosts that share the same access permissions and settings for block storage resources. By adding block storage resources to a host group, the user can simplify the management and allocation of storage for multiple hosts. Access to block storage resources does not need to be set before adding hosts to a host group, as the access permissions can be modified later. Hosts added to a host group can have mapped block storage resources, as long as they are not in conflict with the host group resources. Block storage resources attached to one of the member hosts are not accessible to the entire host group, unless they are also added to the host group.
References: [Dell EMC Unity: Host Configuration], [Dell EMC Unity: Block Storage Provisioning]
質問 # 27
What three VMware datastore types can be defined by using UI or CLI interfaces from the Dell Unity XT platform? (Choose three.)
- A. vVol (Block)
- B. RDM
- C. VMFS (Block)
- D. SMB
- E. NFS (File!
正解：A、C、E
解説：
Explanation
VMware datastore is a logical container that holds virtual machine files and other data. There are three types of VMware datastore that can be defined by using UI or CLI interfaces from the Dell Unity XT platform:
vVol (Block): A vVol datastore is a block-based storage object that is formatted with the VMware Virtual Volumes (vVol) framework and used to store virtual machine files and metadata. A vVol datastore can be created by using the Unisphere UI or the UEMCLI interface on the Dell Unity XT system. A vVol datastore can provide granular control, policy-based management, and improved performance for virtual machines.
NFS (File): An NFS datastore is a file-based storage object that is formatted with the Network File System (NFS) protocol and used to store virtual machine files and other data. An NFS datastore can be created by using the Unisphere UI or the UEMCLI interface on the Dell Unity XT system. An NFS datastore can provide scalability, flexibility, and efficiency for virtual machines.
VMFS (Block): A VMFS datastore is a block-based storage object that is formatted with the VMware File System (VMFS) and used to store virtual machine files and other data. A VMFS datastore can be created by using the Unisphere UI or the UEMCLI interface on the Dell Unity XT system. A VMFS datastore can provide high performance, reliability, and compatibility for virtual machines.
References:
Dell EMC Unity: VMware ESXi Hosts and Clusters
Dell EMC Unity: Unisphere Overview
Dell EMC Unity: Unisphere CLI User Guide
質問 # 28
What is a characteristic of FAST VP?
- A. Fast VP data relocation runs in the background at all times once it is enabled.
- B. Users can set the Fast VP data relocation rate.
- C. Fast VP optimizes data replacement by moving 1 GB slices between disk tiers.
- D. Users can enable or disable FAST VP at the LUN level.
正解：B
解説：
Explanation
FAST VP (Fully Automated Storage Tiering for Virtual Pools) is a feature that automatically moves data within a storage pool based on the performance requirements and access patterns of the data. FAST VP data relocation runs in the background according to a user-defined schedule and rate. The schedule determines when the data relocation starts and ends, and the rate determines how much system resources are used for the data relocation. Users can set the Fast VP data relocation rate to High, Medium, Low, or None. High means that the data relocation has the highest priority and uses the most system resources, while None means that the data relocation is disabled. Fast VP data relocation does not run at all times, but only during the scheduled window. Fast VP optimizes data placement by moving 256 MB slices between disk tiers, not 1 GB slices.
Users cannot enable or disable FAST VP at the LUN level, but only at the storage pool level.
References: [Dell EMC Unity: FAST Technology Overview], [Dell EMC Unity: Storage Pools and RAID Groups]
質問 # 29
What is the maximum size of a drive partnership group when expanding a Dynamic Pool?
- A. 32 drives
- B. 84 drives
- C. 64 drives
- D. 96 drives
正解：A
解説：
Explanation
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.
質問 # 30
Which snapshot option is set automatically when a Pool is configured?
- A. Snapshot Pool Consumption
- B. Pool Automatic Deletion Policy
- C. Total Pool Consumption
正解：B
解説：
Explanation
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]
質問 # 31
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EMC D-UN-DY-23認定を取得することは、Dell Unityストレージシステムの展開と管理におけるあなたの専門知識を証明するものです。この認定は、Dell Unityストレージシステムを使用するIT組織にとって非常に価値があり、ストレージ管理者またはITプロフェッショナルとしてのキャリアアップに役立ちます。
Dell Unityストレージプラットフォームは、データ管理を合理化し、ストレージ効率を向上させたい組織間でますます人気が高まっています。 Dell Unity Deploy 2023認定により、ITプロフェッショナルは、Dell Unityストレージシステムの管理と展開に習熟することを実証する機会を提供します。この認証は、Dell Unityストレージシステムの管理、構成、管理に必要なスキルの検証としてグローバルに認識されています。
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