D-MSS-DS-23: Dell Midrange Storage Solutions Design 2023

Which network option should be configured to provide the best iSCSi performance on a Dell Unity XT array?

Disable flow control
Single VLAN for all traffic
Jumbo frames
iSCSI offload

Correct answer: C

Which CPU family is used on a Dell Unity XT 480?

Haswell
Ice Lake
Broadwell
Skylake

Correct 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.

Which model supports the AppsON feature?

Unity XT
PowerStore X
Unity VSA
PowerStore T

Correct answer: B

Which option should the technical architect recommend?

25 GbE is not supported on Dell Unity or Dell Unity XT systems.
The Dell Unity XT 480 supports a 25 GbE card, but the Dell Unity 550F does not support a 25 GbE card.
All Dell Unity and Dell Unity XT systems support 25 GbE.
The Dell Unity 550F supports a 25 GbE card, but the Dell Unity XT 480 does not support a 25 GbE card.

Correct answer: B

What is the maximum capacity of a file system on a Dell Unity XT 380?

128 TB
32 TB
64 TB
256 TB

Correct answer: C

What is a Dell recommendation when connecting ESXi hosts to PowerStore?

Use the default 32k host I/O size when using VMware NFS Datastores.
Configure a minimum of two NAS servers when using vVol Datastores.
Configure Round Robin Multipathing with an IOPS limit of 1024.
Disable DelayedACK when configured using iSCSI.

Correct answer: D

Explanation:

Dell recommends disabling DelayedACK when configuring ESXi hosts using iSCSI to connect to PowerStore systems. DelayedACK can cause performance degradation and connectivity issues in iSCSI environments. By disabling DelayedACK, the communication between the ESXi host and the PowerStore array becomes more efficient, leading to better performance and reliability.Reference:Dell Technologies documentation on best practices for configuring ESXi hosts with PowerStore using iSCSI.VMware KB article on DelayedACK and its effects on iSCSI performance.

Dell recommends disabling DelayedACK when configuring ESXi hosts using iSCSI to connect to PowerStore systems. DelayedACK can cause performance degradation and connectivity issues in iSCSI environments. By disabling DelayedACK, the communication between the ESXi host and the PowerStore array becomes more efficient, leading to better performance and reliability.

Reference:

Dell Technologies documentation on best practices for configuring ESXi hosts with PowerStore using iSCSI.

VMware KB article on DelayedACK and its effects on iSCSI performance.

How many fans in a Dell EMC PowerStore node can fail before it shuts down?

1
2
3
4

Correct answer: A

Explanation:

A node can tolerate a single fan module fault, and the surviving fans increase their speed to compensate for the faulted module. If two fan modules fault within the same node, the node performs a protective thermal shutdown. A protective thermal shutdown gracefully powers off the node, and any resource fails over to the surviving node Reference: https://www.delltechnologies.com/asset/en-us/products/storage/industry- market/h18149-dell-emc-powerstore-platform-introduction.pdf

What are two guidelines for optimal performance when planning and sizing a Midrange storage solution? (Select 2)

Maximize Flash Drive Capacity
Maximize NVMe NVRAM Capacity
Consolidate Workloads
Design for Resilience

Correct answer: C

Explanation:

When planning and sizing a Midrange storage solution, two key guidelines for optimal performance are to consolidate workloads and design for resilience. Consolidating workloads helps in maximizing the utilization of storage resources, reducing overhead, and improving performance. Designing for resilience ensures that the storage solution can handle failures and continue to operate effectively, maintaining data availability and performance. These practices are critical for achieving reliable and efficient storage solutions.

You are designing a two-tiered Dell EMC SC Series solution that will be optimized for performance. You gather the necessary data from Live Optics and find that the read/write ratio is 80:20.

What approach is recommended?

Size Tier 1 for 100% of the adjusted IOPS
Use distributed adjusted IOPS for all tiers
Use distributed adjusted IOPS for Tiers 1 and 2 only
Size Tier 2 for 100% of the adjusted IOPS

Correct answer: A

Explanation:

"The engineer should design a system to handle all, or nearly all, IOPS in one particular tier"

When designing a system to support Oracle OLAP Workload for a new customer with no I/O details, what are the default selections for the I/O profile input in sizer?

Sequential Read: 70% at 8 KiB Sequential Write: 30% at 8 KiB
Random Read: 70% at 8 KiB Random Write: 30% at 8 KiB
Sequential Read: 80% at 8 KiB Sequential Write: 20% at 8 KiB
Random Read: 50% at 32 KiB Random Write: 50% at 32 KiB

Correct answer: B

Explanation:

When designing a system to support an Oracle OLAP (Online Analytical Processing) Workload for a new customer without specific I/O details, the default selections for the I/O profile input in the sizer tool are typically set to "Random Read: 70% at 8 KiB, Random Write: 30% at 8 KiB." Here's a detailed explanation:* Oracle OLAP Workload Characteristics:OLAP workloads generally involve heavy read operations with a focus on retrieving and analyzing large datasets. The read operations are often random due to the nature of querying various parts of the data.* Default I/O Profile Selection:* Random Read:70% - This reflects the high read intensity typical of OLAP workloads, where data is accessed non-sequentially.* Random Write:30% - Although less frequent than reads, writes still occur randomly as new data is added or existing data is updated.* Sizer Tool Configuration:The Dell sizer tool uses these default I/O profile settings to estimate the required storage performance and capacity. This helps in designing a system that can handle the expected workload efficiently.* Performance Optimization:The chosen I/O profile ensures that the storage system is optimized for the specific access patterns of OLAP workloads, providing a balanced approach to handling both reads and writes.References:* Dell Technologies PowerStore Documentation* Dell Entry-Level and Mid-Range Storage Community* Dell Storage Products OverviewBy understanding the default I/O profile settings used by the sizer tool, system designers can ensure that the storage solution is well-suited to meet the demands of Oracle OLAP workloads.

When designing a system to support an Oracle OLAP (Online Analytical Processing) Workload for a new customer without specific I/O details, the default selections for the I/O profile input in the sizer tool are typically set to "Random Read: 70% at 8 KiB, Random Write: 30% at 8 KiB." Here's a detailed explanation:

* Oracle OLAP Workload Characteristics:OLAP workloads generally involve heavy read operations with a focus on retrieving and analyzing large datasets. The read operations are often random due to the nature of querying various parts of the data.

* Default I/O Profile Selection:

* Random Read:70% - This reflects the high read intensity typical of OLAP workloads, where data is accessed non-sequentially.

* Random Write:30% - Although less frequent than reads, writes still occur randomly as new data is added or existing data is updated.

* Sizer Tool Configuration:The Dell sizer tool uses these default I/O profile settings to estimate the required storage performance and capacity. This helps in designing a system that can handle the expected workload efficiently.

* Performance Optimization:The chosen I/O profile ensures that the storage system is optimized for the specific access patterns of OLAP workloads, providing a balanced approach to handling both reads and writes.

References:

* Dell Technologies PowerStore Documentation

* Dell Entry-Level and Mid-Range Storage Community

* Dell Storage Products Overview

By understanding the default I/O profile settings used by the sizer tool, system designers can ensure that the storage solution is well-suited to meet the demands of Oracle OLAP workloads.