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EMC D-UN-DY-23 exam is a multiple-choice exam that consists of 60 questions. You will have 90 minutes to complete the exam and must achieve a passing score of 63% or higher to earn the certification.
NEW QUESTION # 19
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
Answer: C
NEW QUESTION # 20
What are two prerequisites when creating host configuration for NFS client? (Choose two.)
- A. Subnet access
- B. Tenant information
- C. Hostname
- D. Network Address
Answer: C,D
Explanation:
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
NEW QUESTION # 21
Into what size slices is the LUN partitioned for RAID extents?
- A. 256 MB
- B. 512MB
- C. 64 MB
- D. 128 MB
Answer: D
Explanation:
Explanation
A LUN is a logical unit of storage that is presented to a host as a SCSI device. A LUN is composed of one or more RAID extents, which are the smallest units of storage that can be allocated to a LUN. A RAID extent is a slice of a RAID group that is used to store user data and parity information. The size of a RAID extent depends on the RAID type and the drive type of the RAID group. For example, a RAID 5 extent on a SAS drive is 128 MB, while a RAID 6 extent on a NL-SAS drive is 256 MB. The LUN is partitioned into slices that match the size of the RAID extents, and each slice is mapped to a RAID extent from a RAID group in the storage pool. The LUN slices are distributed across multiple RAID groups to improve performance and availability. References:
Dell EMC Unity: Storage Pools and RAID Groups
Dell EMC Unity: LUN Management
NEW QUESTION # 22
An administrator has configured a Host Group to have access to a storage object.
What are two benefits of this configuration? (Choose two.)
- A. Provides multiple hosts access to the same LUNs
- B. Provides multiple hosts the same access to NFS Filesvstems
- C. Ensures that snapshots are applied to all LUNs in the group
- D. Provides multiple hosts access to the same VMFS Datastores
- E. Ensures that block storage is replicated to the same hosts
Answer: A,D
Explanation:
Explanation
A Host Group is a logical grouping of hosts that share the same access permissions to storage objects, such as LUNs, VMFS Datastores, or NFS Filesystems. By configuring a Host Group, an administrator can simplify the management of multiple hosts and ensure consistent access to the storage resources. Some of the benefits of using a Host Group are:
Provides multiple hosts access to the same VMFS Datastores: 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. A VMFS Datastore can be shared by multiple hosts that are part of a VMware cluster. By adding these hosts to a Host Group and assigning the VMFS Datastore to the Host Group, the administrator can ensure that all the hosts have the same access permissions and can access the virtual machines on the Datastore.
Provides multiple hosts access to the same LUNs: A LUN is a block-based storage object that is presented to a host as a SCSI device. A LUN can be shared by multiple hosts that have the same operating system and use a cluster-aware file system. By adding these hosts to a Host Group and assigning the LUN to the Host Group, the administrator can ensure that all the hosts have the same access permissions and can access the data on the LUN.
References:
Dell EMC Unity: Host Configuration
Dell EMC Unity: VMware ESXi Hosts and Clusters
NEW QUESTION # 23
Which disk format is recommended when deploying Dell UnityVSA OVA?
- A. Thick Provision Eager Zeroed
- B. Thin Provision
- C. Thick Provision Lazy Zeroed
Answer: A
Explanation:
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]
NEW QUESTION # 24
Which I/O modules does the Unity 380/380F system support?
- A. 32 Gb/s Fibre Channel
10 GbE Base-T - B. 32 Gb/s Fibre Channel
2-Port 100 GbE - C. 12 Gb/s SAS
2-Port 100 GbE - D. 12 Gb/s SAS
10 GbE Base-T
Answer: D
Explanation:
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
NEW QUESTION # 25
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. Perform Local LUN Move.
- B. Unmask the LUNfrom host.
- C. Chanqe Tierinq Policy to Auto-Tier.
- D. Disable the Data Reduction.
Answer: A
Explanation:
Explanation
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.
NEW QUESTION # 26
A storage engineer was asked to restore a LUN snapshot using a previous copy.
What is the correct sequence of steps for a restore process?
Answer:
Explanation:
Explanation
https://www.delltechnologies.com/asset/en-us/products/storage/industry-market/h15089-dell_emc_unity-snapsho
NEW QUESTION # 27
Which firewall ports are required to be open for a successful outbound connection when configuring integrated secure connect gateway?
- A. 80 and 9443
- B. 9443 and 443
- C. 80 and 443
- D. 443 and 8443
Answer: D
Explanation:
Explanation
The firewall ports that are required to be open for a successful outbound connection when configuring integrated secure connect gateway are 443 and 8443. Integrated secure connect gateway is a feature that enables secure remote access to the Dell Unity system through the Unisphere Central web portal. It requires an outbound connection from the Dell Unity system to the Unisphere Central server over the internet. Port 443 is used for HTTPS communication and port 8443 is used for WebSocket communication.
References: [Dell EMC Unity: Unisphere Overview], [Dell EMC Unity: Integrated Secure Connect Gateway]
NEW QUESTION # 28
A deployment engineer has changed theSchedule Time Zoneunder the Settings menu. However, existing snapshots schedules continue to run at the previously configured time.
Why is this occurring?
- A. The Unity system time is not set correctly and must be updated under system settings.
- B. The Unity management server was not restarted before time zone changes took effect.
- C. Existing snapshot schedules are not updated to the same absolute time when the time zone is changed.
- D. Existing snapshot schedules cannot be updated to the same absolute time.
Answer: C
Explanation:
Explanation
When the Schedule Time Zone is changed under the Settings menu, it only affects the display of the time zone and the creation of new snapshot schedules. Existing snapshot schedules are not automatically adjusted to the new time zone, and will continue to run at the same absolute time as before. For example, if a snapshot schedule was created to run every day at 10:00 AM inGMT+1, and the Schedule Time Zone was changed to GMT+2, the snapshot schedule will still run at 10:00 AM in GMT+1, which is 11:00 AM in GMT+2. To update the existing snapshot schedules to the new time zone, the administrator must edit each schedule manually and change the start time accordingly. References: Dell EMC Unity: Snapshots and Thin Clones1, page 16.
NEW QUESTION # 29
What is a characteristic of Host Groups?
- A. Block storage resources addedlo a host group are accessible to all the member hosts
- B. Access to block storage resources must be set before adding hosts to a host group.
- C. Block storage resources attached to one of the member hosts are accessible to the entire host group.
- D. Hosts added to a host group must not have mapped block storage resources.
Answer: A
Explanation:
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]
NEW QUESTION # 30
Multiple I/O modules must be installed in Dell Unity XT 680 storage.
Which module must be installed in slot 0?
- A. 4-Port 16 Gb Fibre Channel
- B. 12 Gb/s SAS back-end
- C. 4-Port 25 Gbps Ethernet
- D. 4-Port 10 Gbps Ethernet
Answer: B
Explanation:
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
NEW QUESTION # 31
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
Answer: A
Explanation:
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]
NEW QUESTION # 32
Which feature can be configured for a Dell Unity XT file system NFS share?
- A. Access-Based Enumeration
- B. Distributed File System
- C. Host Access Level
- D. Protocol Encryption
Answer: C
Explanation:
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]
NEW QUESTION # 33
In an asynchronous replication, what is the maximum number of replicated NAS servers supported for the Dell Unity XT 380 series?
- A. 0
- B. 1
- C. 2
- D. 3
Answer: C
Explanation:
Explanation
The maximum number of replicated NAS servers supported for the Dell Unity XT 380 series in an asynchronous replication is 126. This is the same as the maximum number of NAS servers supported for the Dell Unity XT 380 series in general. Asynchronous replication is a method of replicating data between two Dell Unity systems with a configurable recovery point objective (RPO). It allows the source system to continue normal operations without waiting for the destination system to acknowledge the completion of the replication.
References: [Dell EMC Unity: Replication Technologies], [Dell EMC Unity: NAS Capabilities]
NEW QUESTION # 34
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