[Dec 05, 2025] D-MSS-DS-23 PDF Questions and Testing Engine With 88 Questions
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EMC D-MSS-DS-23 Exam Syllabus Topics:
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NEW QUESTION # 17
The CPU utilization in a Dell Unity XT system is currently at 68%. What is the level of CPU utilization?
- A. Extremely High Utilization
- B. High Utilization
- C. Normal Utilization
- D. Low Utilization
Answer: C
Explanation:
The Dell Unity XT storage systems have defined thresholds for various resource utilizations, including CPU utilization. According to the Dell Unity XT Best Practices and Performance Guidelines (DELL UNITY:
BEST PRACTICES GUIDE, Dell Technologies, Dell Unity OE version 5.x), the typical CPU utilization levels are classified as follows:
Normal Utilization:CPU usage under typical operating conditions generally ranges from 40% to 70%. This is considered optimal and normal for Unity XT systems.
High Utilization:CPU usage between 70% and 85% is considered high but generally still within operational norms.
Extremely High Utilization:Above 85% utilization may lead to performance impacts and should be investigated.
Low Utilization:Utilization below 40% may indicate under-utilization of resources or low system activity.
Since the CPU utilization in this case is68%, it falls in the range of normal utilization. It suggests that the system is performing well and efficiently handling the workload without strain.
This categorization ensures that administrators can quickly assess system health and identify potential bottlenecks or underutilization issues. The Dell Unity XT storage system's management interface and performance monitoring tools (like Unisphere or CloudIQ) also align with these utilization thresholds.
Reference:
Dell Unity: Best Practices Guide, Dell Technologies, Dell Unity OE 5.x
Dell EMC Unity Family: Introduction to the Platform, Dell Technologies
Dell EMC Unity Performance Metrics (Unisphere and CloudIQ documentation)
NEW QUESTION # 18
A systems administrator has deployed a Dell Unity XT 380F system with 15x 1.92 TB SSD drives, in a RAID
5 dynamic pool. Shortly after deployment, the administrator wants to expand the capacity of the system and use larger drives to increase the density. What will happen if the administrator adds 4x 3.84 TB SSD drives?
- A. The mixing of drive types is not supported, and the operation will fail.
- B. Only half of the capacity of the new drives will be available.
- C. The full capacity of the drives will be available.
- D. Three of the drives will be added with a fourth reserved as spare.
Answer: C
Explanation:
When the administrator adds 4x 3.84 TB SSD drives to a RAID 5 dynamic pool in a Dell Unity XT 380F system, the full capacity of the new drives will be available. Dell Unity XT systems support mixing different drive sizes within a dynamic pool, allowing administrators to expand the storage capacity seamlessly.
NEW QUESTION # 19
From which Dell EMC storage system can a Dell EMC PowerStore array natively import data?
- A. PowerVault
- B. VMAX
- C. VNX
- D. VNX2
Answer: D
NEW QUESTION # 20
A customer wants to asynchronously replicate file data from a production Dell Unity 550F to a remote office in the same city with a UnityVSA When attempting to replicate one of the file systems the replication option is not available.
What should a technical architect advise the customer?
- A. Asynchronous replication is not supported to a UnityVSA
- B. Asynchronous replication requires a greater replication distance
- C. The NAS server for the file system must be replicated
- D. Only synchronous replication is supported on file systems
Answer: C
NEW QUESTION # 21
Which NAS protocols does Dell PowerStore support?
- A. FTP, SMB, NFSv2, NFSv3, and FTPS
- B. FTPS, SMB, NFSv3, NFSv4, and FTP
- C. SMB, NFSv3, NFSv4p, FTP, and SFTP
- D. NFSv4, SMB, S3, FTP, and SFTP
Answer: C
Explanation:
Dell PowerStore supports a variety of NAS protocols to provide file access to clients.
These protocols include:
SMB (Server Message Block): This protocol is used to provide file and printer sharing on Windows-based systems.
NFSv3 (Network File System version 3): This is a standard protocol used to provide file access on UNIX-based systems.
NFSv4 (Network File System version 4): This is the latest version of the NFS protocol and it provides enhanced security and improved performance over previous versions. FTP (File Transfer Protocol): This is a standard protocol used to transfer files between computers over a network.
SFTP (Secure File Transfer Protocol): This is an extension of the FTP protocol that provides secure file transfer using SSH (Secure Shell) encryption.
NEW QUESTION # 22
Which block resources are supported with Dell EMC Unity asynchronous replication?
- A. LUNs and VMFS datastores
- B. LUNs and file systems
- C. Consistency Groups and file systems
- D. VMFS and NFS datastores
Answer: B
Explanation:
Reference: https://cdn2.hubspot.net/hubfs/1885982/dell-emc-unity-unisphere- overview.pdf?t=1543339206682
NEW QUESTION # 23
Which Dell EMC Unity feature provides network high availability with active-passive ports when provisioning File storage for a NAS client?
- A. Fail-safe Networking
- B. Preferred Interfaces
- C. Redundant Interfaces
- D. Link Aggregation
Answer: A
Explanation:
Document: docu71319_dell-emc-unity-high-availability-a-detailed-review.pdf Page: 20 FAIL SAFE NETWORKING (FSN) Dell EMC Unity OE version 4.2.1 introduces Fail Safe Networking (FSN).
FSN is a high availability feature that extends link failover into the network by providing switch- level redundancy. FSN appears as a single link with a single MAC address and potentially multiple IP addresses. FSN can consists of Ethernet ports, link aggregations, or any combination of the two. FSN adds an extra layer of availability to link aggregations alone as link aggregations provide availability in the event of a port failure while FSN provides availability in the event of a switch failure. Each port or Link aggregation is considered as a single connection and only the primary port or link aggregation in an FSN is active at a time. All ports in an FSN must have the same MTU size, but the speed and duplex settings can vary.
NEW QUESTION # 24
Which backend port are required to expand the PowerStore x200 models to have NVMe Expansions?
- A. 32 Gb FC I/O Module
- B. 100 GbE 2-port Mezz card
- C. 25 GbE 4-Port Mezz Card
Answer: B
Explanation:
InDell PowerStore X200models (part of Dell's midrange storage portfolio), NVMe expansions are supported by leveraging the NVMe-oF (NVMe over Fabrics) capabilities. Specifically, NVMe expansions require high- speed backend connectivity, and in these models, this is provided by a100 GbE 2-port Mezz card.
Here's the step-by-step explanation:
#NVMe Expansion Architecture:
PowerStore uses NVMe drives for extremely low latency and high throughput. To expand the system and connect additional NVMe expansion enclosures (like PowerStore's NVMe Expansion Enclosures), you need backend ports that support NVMe connectivity.
#Backend Port Choice:
The100 GbE 2-port Mezz cardis explicitly designed to support these NVMe backend connections. It provides the necessary bandwidth and low latency to support the NVMe expansion enclosures.
#Why not the other options?
The25 GbE 4-port Mezz cardis typically used for front-end host connectivity and does not support backend NVMe expansion.
The32 Gb FC I/O Moduleis for Fibre Channel SAN connectivity, not for NVMe backend expansions.
#Documentation Reference:
The officialDell PowerStore Technical SpecificationsandDell PowerStore Hardware Information Guidestate that the backend connectivity for NVMe expansions in PowerStore X200 systems relies on the100 GbE 2-port Mezzanine card.
Reference:
Dell PowerStore Technical Specifications (Dell Technologies)
Dell PowerStore Hardware Information Guide (Dell Technologies)
Dell PowerStore: NVMe Expansion Enclosure Overview
NEW QUESTION # 25
Which option should the technical architect recommend?
- A. 25 GbE is not supported on Dell Unity or Dell Unity XT systems.
- B. All Dell Unity and Dell Unity XT systems support 25 GbE.
- C. The Dell Unity XT 480 supports a 25 GbE card, but the Dell Unity 550F does not support a 25 GbE card.
- D. The Dell Unity 550F supports a 25 GbE card, but the Dell Unity XT 480 does not support a 25 GbE card.
Answer: C
NEW QUESTION # 26
Which CPU family is used on a Dell Unity XT 480?
- A. Ice Lake
- B. Skylake
- C. Broadwell
- D. Haswell
Answer: C
Explanation:
The Dell Unity XT 480 storage system uses the Broadwell CPU family. Broadwell processors are known for their efficiency and performance, making them suitable for storage systems like the Unity XT 480 that require reliable processing power for managing storage tasks.
Reference:
Dell Unity XT 480 Specification Sheet.
Dell Technologies documentation on Unity XT hardware configurations.
NEW QUESTION # 27
What chunk size of data is identified and moved temporarily to FAST Cache within Unity?
- A. 256 KB
- B. 128 KB
- C. 32 KB
- D. 64 KB
Answer: B
Explanation:
* FAST Cache Mechanism:
* FAST (Fully Automated Storage Tiering) Cache in Dell Unity systems temporarily holds frequently accessed data to improve read and write performance.
* The data moved to FAST Cache is managed in chunks to optimize storage efficiency and performance.
* Chunk Size for FAST Cache:
* Dell Unity systems use a chunk size of 128 KB for data moved to FAST Cache. This size is optimized for balancing performance and storage management overhead.
* Smaller chunks, such as 32 KB or 64 KB, might increase management overhead, while larger chunks like 256 KB could reduce the granularity of data movement and efficiency.
* Dell Midrange Storage References:
* Dell Unity XT documentation provides detailed explanations on FAST Cache operations, including the specific chunk sizes used.
* Additional technical resources from Dell Technologies offer insights into performance tuning and cache management.
References:
* Dell Unity XT FAST Cache Guide
* Dell Community on Cache Management
* Dell Storage Product Information
NEW QUESTION # 28
What is a key feature of the Dell EMC Future-Proof Storage Loyalty Program for Dell EMC SC Series arrays?
- A. 4:1 Efficiency Guarantee
- B. 4 Year Satisfaction Guarantee
- C. 4:1 Performance Guarantee
- D. 4:1 Reduction Guarantee
Answer: A
Explanation:
Dell EMC Flash Storage Efficiency Guarantee Dell EMC promises our flash arrays will provide a logical usable capacity at least four times the usable physical capacity of your purchased drives -- or we'll give you more drives at no charge.
NEW QUESTION # 29
What is done during the preconfigure step of a PowerStore block import migration?
- A. Destination volume is created.
- B. Source system is added to the PowerStore.
- C. Network connectivity is set up.
- D. Import schedule is set.
Answer: C
Explanation:
During the preconfigure step of a PowerStore block import migration, network connectivity is set up. This step is crucial for ensuring that the source system can communicate with the PowerStore system, which is necessary for a successful data transfer during the migration process. Here are the detailed steps involved in this phase:
Assess Network Requirements: Evaluate the existing network infrastructure to ensure it meets the requirements for a PowerStore migration. This includes checking the bandwidth, latency, and network topology.
Configure Network Settings: Set up the network settings on both the source and destination systems. This involves configuring IP addresses, subnet masks, gateways, and any other network parameters required for connectivity.
Verify Connectivity: Use network diagnostic tools to verify that the source system can communicate with the PowerStore system. This might involve ping tests, traceroutes, and other connectivity checks.
Secure the Network: Implement necessary security measures to protect the data during migration. This can include setting up firewalls, VPNs, or other security protocols to ensure data integrity and confidentiality.
Establish Data Paths: Create and configure data paths between the source system and the PowerStore system. This ensures that data can be transferred efficiently and without interruption during the migration process.
Test Network Performance: Conduct performance tests to ensure that the network can handle the data transfer load. This helps identify and mitigate any potential bottlenecks that could affect the migration.
NEW QUESTION # 30
What is a consideration when sizing a Dell EMC SC Series system for capacity?
- A. Page size
- B. IOPS
- C. Read/Write ratio
- D. RAID overhead
Answer: D
Explanation:
(Input/Output Operations Per Second) is a key consideration when sizing a Dell EMC SC Series system for capacity. IOPS is a measure of the performance of a storage system, and a higher number of IOPS generally indicates better performance. Other factors to consider would be the number of disk drives, RAID configuration, and storage capacity required for the specific use case.
NEW QUESTION # 31
A systems administrator has deployed a Dell Unity XT 380F system with 15x 1.92 TB SSD drives, in a RAID
5 dynamic pool. Shortly after deployment, the administrator wants to expand the capacity of the system and use larger drives to increase the density. What will happen if the administrator adds 4x 3.84 TB SSD drives?
- A. The mixing of drive types is not supported, and the operation will fail.
- B. Three of the drives will be added with a fourth reserved as spare.
- C. Only half of the capacity of the new drives will be available.
- D. The full capacity of the drives will be available.
Answer: C
Explanation:
InDell Unity XT dynamic pools, when new drives are added to an existing pool, the system automatically integrates these drives into the pool. However,Unity XT dynamic pools only use the capacity of new drives up to the size of the smallest drive in the pool(a concept known ascapacity equalization).
#What happens here?
The original pool was created with1.92 TB SSD drives.
The administrator adds4 x 3.84 TB SSD drivesto the same pool.
Because the pool's smallest drive is1.92 TB, the system uses only1.92 TBof capacity from each of the new drives.
The remaining1.92 TBof the new drives' capacity isnot utilizedin the dynamic pool.
#Key Takeaways:
This behavior ensures uniform capacity usage across all drives in the pool, maintainingRAID group balance and data distribution.
To fully leverage the 3.84 TB capacity, the administrator would need to create anew poolusing only the larger drives.
#Documentation Reference:
Dell EMC Unity XT Best Practices Guide (Dell Technologies)- Discusses dynamic pool behavior and drive capacity equalization.
Dell EMC Unity XT Dynamic Pools Technical White Paper- Provides detailed explanations on how dynamic pools manage mixed drive sizes.
NEW QUESTION # 32
A customer with a Dell Unity XT 680 asks about enabling the Advanced Deduplication feature.
Which configuration is recommended for enabling the feature?
- A. On All-Flash pools with free capacity above 20%
- B. On hybrid pools with free capacity above 20%
- C. On All-Flash pools when CPU utilization is at or less than 50%
- D. On hybrid pools when CPU utilization is at or less than 50%
Answer: C
NEW QUESTION # 33
A systems administrator has deployed a Dell Unity XT 380F system with 15x 1.92 TB SSD drives, in a RAID
5 dynamic pool. Shortly after deployment, the administrator wants to expand the capacity of the system and use larger drives to increase the density. What will happen if the administrator adds 4x 3.84 TB SSD drives?
- A. The mixing of drive types is not supported, and the operation will fail.
- B. Three of the drives will be added with a fourth reserved as spare.
- C. Only half of the capacity of the new drives will be available.
- D. The full capacity of the drives will be available.
Answer: C
Explanation:
InDell Unity XT dynamic pools, when new drives are added to an existing pool, the system automatically integrates these drives into the pool. However,Unity XT dynamic pools only use the capacity of new drives up to the size of the smallest drive in the pool(a concept known ascapacity equalization).
#What happens here?
The original pool was created with1.92 TB SSD drives.
The administrator adds4 x 3.84 TB SSD drivesto the same pool.
Because the pool's smallest drive is1.92 TB, the system uses only1.92 TBof capacity from each of the new drives.
The remaining1.92 TBof the new drives' capacity isnot utilizedin the dynamic pool.
#Key Takeaways:
This behavior ensures uniform capacity usage across all drives in the pool, maintainingRAID group balance and data distribution.
To fully leverage the 3.84 TB capacity, the administrator would need to create anew poolusing only the larger drives.
#Documentation Reference:
Dell EMC Unity XT Best Practices Guide (Dell Technologies)- Discusses dynamic pool behavior and drive capacity equalization.
Dell EMC Unity XT Dynamic Pools Technical White Paper- Provides detailed explanations on how dynamic pools manage mixed drive sizes.
NEW QUESTION # 34
What is the recommended order for connecting DAEs to SAS ports when only two ports are available on each SP of a Dell Unity XT DPE?
- A. DAE 1 to SAS Bus 0 DAE 2 to SAS Bus 0 DAE 3 to SAS Bus 1
- B. DAE 1 to SAS Bus 1 DAE 2 to SAS Bus 1 DAE 3 to SAS Bus 0
- C. DAE 1 to SAS Bus 1 DAE 2 to SAS Bus 0 DAE 3 to SAS Bus 1
- D. DAE 1 to SAS Bus 0 DAE 2 to SAS Bus 1 DAE 3 to SAS Bus 0
Answer: D
Explanation:
When connecting Disk Array Enclosures (DAEs) to SAS ports on a Dell Unity XT DPE (Disk Processor Enclosure) with only two ports available on each SP (Storage Processor), the recommended order is DAE 1 to SAS Bus 0, DAE 2 to SAS Bus 1, and DAE 3 to SAS Bus 0. This configuration helps in balancing the load across the available SAS ports, ensuring optimal data flow and performance.
NEW QUESTION # 35
What is the recommended order for connecting DAEs to SAS ports when only two ports are available on each SP of a Dell Unity XT DPE?
- A. DAE 1 to SAS Bus 0 DAE 2 to SAS Bus 0 DAE 3 to SAS Bus 1
- B. DAE 1 to SAS Bus 1 DAE 2 to SAS Bus 1 DAE 3 to SAS Bus 0
- C. DAE 1 to SAS Bus 1 DAE 2 to SAS Bus 0 DAE 3 to SAS Bus 1
- D. DAE 1 to SAS Bus 0 DAE 2 to SAS Bus 1 DAE 3 to SAS Bus 0
Answer: D
Explanation:
When connecting Disk Array Enclosures (DAEs) to SAS ports on a Dell Unity XT DPE (Disk Processor Enclosure) with only two ports available on each SP (Storage Processor), the recommended order is DAE 1 to SAS Bus 0, DAE 2 to SAS Bus 1, and DAE 3 to SAS Bus 0. This configuration helps in balancing the load across the available SAS ports, ensuring optimal data flow and performance. Reference:Dell Unity XT Configuration Guide
NEW QUESTION # 36
What are components of a Dell PowerStore Base Volume Family?
- A. Thin clones, snapshots, and original volume only
- B. Thin clones and snapshots only
- C. Thin clones, snapshots, original volume, and replication target
- D. Snapshots, original volume, and replication target only
Answer: C
Explanation:
According to Dell PowerStore documentation (PowerStore OS 2.0+):
A Base Volume Family logically groups:
Original volume (source)
Snapshots (point-in-time copies)
Thin clones (writable snapshots)
Replication targets (synchronized copies for disaster recovery)
This unified structure simplifies management and ensures data consistency across all derived volumes.
Source: Dell PowerStore Administration Guide (Section: Volume Families, Page 97).
NEW QUESTION # 37
A customer has a PowerStore 3200T system with only base enclosure consisting of 15 SSD 1920 GB drives and wants to expand the available capacity. What is the most cost-effective drive addition from a raw and usable capacity perspective to achieve the result wanted by the customer?
- A. 6 x 1920 NVMe SSD drives
- B. 6 x 750 GB NVMe SCM drives
- C. 6 x 3840 NVMe SSD drives
Answer: C
Explanation:
Adding 6 x 3840 GB NVMe SSD drives is the most cost-effective way to expand the capacity of a PowerStore 3200T system. This addition provides a significant increase in both raw and usable capacity, offering a better balance of performance and cost compared to smaller or more expensive drive options.
NEW QUESTION # 38
Which NVMe SSDs are supported by Dell EMC PowerStore?
- A. 3840 GB, 7680 GB, and 15360 GB only
- B. 960 GB, 1920 GB, 3840 GB, and 7680 GB
- C. 1920 GB, 3840 GB, 7680 GB, and 15360 GB
- D. 1920 GB, 3840 GB, and 7680 GB only
Answer: C
Explanation:
https://www.delltechnologies.com/resources/en-us/asset/data-sheets/products/storage/h18143- dell-emc-powerstore-family-spec-sheet.pdf
NEW QUESTION # 39
Which two statements are correct for a PowerStore 5200T with mixed SSD and drive combination? (Select 2)
- A. Expansion Enclosures are supported
- B. NVMe drives are not used for Caching and Vaulting
- C. SSD drives are used for metadata tiering
- D. SCM drives do not add to usable capacity
Answer: A,D
NEW QUESTION # 40
An ISP needs a data storage solution that allows them to set policies over resource usage. The solution needs to support network multi-tenancy while also providing full network failover protection. What combination of Dell EMC SC Series features meets these requirements?
- A. Thin Replication and Storage Profiles
- B. Multi-protocol and Live Volume
- C. /QoS
- D. Replication and vVols
Answer: C
NEW QUESTION # 41
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