D-MSS-DS-23 Exam Dumps - EMC Storage Administrator Questions and Answers

SAS Flash 3 drives(also known asRead-Intensive (RI)SSDs in Dell Unity XT environments) are typically rated at3 Drive Writes Per Day (DWPD).

✅What does 3 DWPD mean?

It means that these drives are designed to safely handle writingthree times their entire capacity every dayover their warranty period (usually 5 years).

For example, a 1TB SAS Flash 3 drive can handle up to3TB of writes per daywithout exceeding its endurance specification.

✅Why is this important?

The DWPD metric is a crucial factor in determining whether a drive’s endurance matches the expected workload.

3 DWPDstrikes a balance betweenenduranceandcostin most general-purpose storage workloads.

✅Where is this documented?

TheDell EMC Unity XT Best Practices Guideand theDell EMC Unity XT Drive Specification Guidedetail the DWPD ratings for different flash drive types, including SAS Flash 3 drives.

Dell’s documentation confirms that SAS Flash 3 drives (RI SSDs) are rated at3 DWPD.

Grab Tool Overview:

The Grab tool is used for collecting diagnostic information from host systems to aid in troubleshooting and performance analysis.

Supported Operating Systems:

The Grab tool can run on a variety of host operating systems, including Windows, UNIX, and ESXi.

This broad support ensures that administrators can gather necessary diagnostic data across different environments.

Other Options:

Linux, macOS, and Tru64: Not all these operating systems are supported by the Grab tool.

OS/390, Windows, and Linux: OS/390 is not commonly supported.

ESXi, ChromeOS, and OS/390: ChromeOS and OS/390 are not typically supported by the Grab tool.

Dell Midrange Storage References:

Dell documentation provides detailed instructions on using the Grab tool and lists the supported operating systems.

Community forums and support resources from Dell Technologies offer additional insights and user experiences.

During the "Create a file import session" in a PowerStore file import, options for import are specified. This step involves configuring various settings and parameters for the import session, such as the source and destination details, data migration policies, and any specific options that need to be applied during the import process. This ensures a smooth and controlled data migration. Reference:Dell PowerStore File Import Guide

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The minimum number of drives in a RAID 5 dynamic pool is 5. RAID 5 requires at least 3 drives for data striping with parity, but Dell's implementation in Unity systems requires a minimum of 5 drives to ensure optimal performance and reliability.

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The maximum throughput per port in backend 12 Gb SAS (Serial Attached SCSI) ports in Dell Unity XT arrays is 2500 Mbps. SAS ports are used to connect storage devices and provide high-speed data transfer capabilities:

12 Gb SAS Standard:The 12 Gb SAS standard supports high data transfer rates, making it suitable for enterprise storage systems that require robust performance and reliability.

Performance Metrics:Each 12 Gb SAS port can achieve up to 2500 Mbps, which translates to approximately 2.5 Gbps of throughput, supporting high-performance storage operations.

PowerStore Clustering:

PowerStore appliances can be clustered to form a single management entity. However, adding different models within the same cluster follows specific guidelines.

Cluster Compatibility:

PowerStore 1000T and 5000X are different models with potentially different hardware configurations and capabilities.

Dell recommends creating a new cluster with the PowerStore 5000X instead of mixing models within an existing cluster to ensure compatibility and optimal performance.

Adding Appliances:

Using the PowerStore CLI or PowerStore Manager to add appliances within the same model range is common, but mixing models generally requires creating a separate cluster.

Dell Midrange Storage References:

Dell PowerStore documentation provides guidelines on clustering and appliance management, highlighting the importance of model compatibility.

CloudIQ Mobile App Features:

CloudIQ provides comprehensive monitoring and management for Dell storage platforms, accessible through both web and mobile apps.

Supported Features:

Overview of Health, Capacity, and Performance: The mobile app provides users with an overview of the health, capacity, and performance details for supported Dell storage platforms.

Email Recommended Remediation: The app allows users to email recommended remediation steps to colleagues, facilitating collaboration and resolution of identified issues.

Other Features:

Manage Capacity and Performance Details: While the mobile app provides an overview, detailed management typically requires access through the web interface.

Access Controls and User Roles: Setting up access controls and assigning user roles is generally managed through the primary CloudIQ interface rather than the mobile app.

Dell Midrange Storage References:

CloudIQ documentation and mobile app guides detail the features available to users for monitoring and collaboration.

Community forums and support resources from Dell Technologies provide additional insights into using CloudIQ effectively.

Data Reduction in Dell Unity XT:

Data reduction technologies (deduplication and compression) are resource-intensive operations that require careful consideration of system conditions before enabling.

Efficient data reduction improves storage utilization and performance but can significantly impact CPU resources.

Enabling Data Reduction:

The ideal condition for enabling data reduction on a Dell Unity XT system is when the CPU utilization is manageable.

A CPU utilization at or less than 50% ensures that the system has enough headroom to handle the additional processing load without compromising overall performance.

System Conditions:

CPU utilization above 80%: Enabling data reduction under high CPU load can degrade performance and lead to system instability.

Free capacity above 80%: High free capacity does not directly impact the ability to enable data reduction but does indicate ample storage space.

Free capacity at or less than 50%: Lower free capacity might indicate higher utilization, which can stress the system when data reduction is enabled.

CPU utilization at or less than 50%: This condition is optimal for ensuring that the system can efficiently manage data reduction processes without adverse effects.

Dell Midrange Storage References:

Dell Unity XT documentation provides clear guidelines on performance tuning and best practices for enabling data reduction.

Additional resources from Dell's community forums and product support pages offer insights into real-world configurations and expert recommendations.