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

Dynamic Pool Configuration with RAID 5:

RAID 5 (4+1) protection involves 4 data drives and 1 parity drive.

Minimum Drive Count:

For creating a dynamic pool with RAID 5 (4+1), the configuration must include at least 2 RAID 5 (4+1) groups to ensure redundancy and performance.

The minimum drive count for this setup would be 2 * (4 + 1) + 1 (hot spare) = 11 drives.

RAID 5 Requirements:

This configuration ensures that the dynamic pool has enough drives to maintain performance and data protection according to Dell’s best practices.

Dell Midrange Storage References:

Dell Unity XT documentation provides detailed guidelines on RAID configurations and the minimum drive requirements for dynamic pools.

Community forums and support resources from Dell Technologies offer insights into best practices for configuring RAID and dynamic pools.

For a customer preparing for a data center maintenance window and wanting to test their disaster recovery plan, the recommended PowerStore Manager replication option is a planned failover from the source site. This process involves initiating the failover from the source site, ensuring a controlled transition of applications and services to the disaster recovery site. Planned failover allows for testing the disaster recovery plan while maintaining data integrity. Reference:Dell PowerStore Replication Best Practices

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Dell Unity XT offers both synchronous and asynchronous replication to protect data and ensure business continuity.

Synchronous replication is used for zero RPO, ensuring no data loss, but it is typically limited to shorter distances due to latency concerns.

Asynchronous replication is suitable for longer distances and provides near real-time data protection with a minimal RPO.

Distance Considerations:

The distance between Boston and Cambridge (8 km) is suitable for synchronous replication, providing zero RPO.

The distance between Boston and New York (342 km) is better suited for asynchronous replication due to latency, ensuring data recovery with a minimal RPO, such as 15 minutes.

Optimal Replication Strategy:

Synchronous replication from Boston to Cambridge ensures zero RPO for critical data protection.

Asynchronous replication from Boston to New York provides additional data protection with a 15-minute RPO, suitable for longer-distance disaster recovery.

Dell Midrange Storage References:

Dell Unity XT documentation and best practices provide detailed guidelines on configuring synchronous and asynchronous replication.

Community forums and support resources from Dell Technologies offer insights into real-world implementation strategies.

ENS24 Expansion Enclosure is an NVMe expansion enclosure. - The ENS24 uses NVMe over Fabric (NVMe/oF) standards. Delivers an end-to-end NVMe solution. - Slots for 24 2.5-inch, NVMe drives. - Performance equal to the local PCIe NVMe drives with a 10-microsecond delay. - Requires that the base enclosure includes the v2 embedded module and a 100 GbE 2-port card. - Not supported on systems that include SAS expansion enclosures. - Does not support NVMe SCM drives and is not supported with SCM-only base enclosures.

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When evaluating an existing Dell Unity XT system configuration,telemetry data(health and performance logs) is crucial for diagnostics and performance analysis. Dell Unity XT providestwo primary methodsfor collecting telemetry files:

✅A. unity_service_data collects

This is a common method using the svc_data command to gather comprehensive logs and telemetry data for Dell Unity XT systems.

The commandcollects service dataincluding health, performance, and diagnostic logs.

It is often used by support engineers and system administrators to troubleshoot and evaluate system health.

✅B. UEMCLI

UEMCLI (Unity CLI) is a command-line interface for managing Dell Unity systems.

It provides commands to collect telemetry and diagnostic information.

For example, you can use commands like:

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uemcli -d -u -p /service/system/collect-service-data

UEMCLI is flexible, scriptable, and often used in automated telemetry collection for system evaluations.

❌Why not the other options?

C. PSTCLI– This CLI is used with PowerStore systems, not Unity XT.

D. unity_telemetry_data collects– This is not a valid or recognized command within Unity XT’s official documentation or CLI reference.

✅Documentation Reference:

Dell EMC Unity: Service Commands and Diagnostics Guide (Dell Technologies)

Dell EMC Unity XT CLI Command Reference Guide (UEMCLI usage)

Dell EMC Unity XT Best Practices Guide– covers recommended methods for collecting and using service data and telemetry files.

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SSD Wear Alerts in Unity XT:

Dell Unity XT systems monitor SSD wear and issue alerts at various intervals (180, 90, 60, and 30 days) before the predicted end of life.

Action at 30 Days:

At the 30-day alert, the system automatically initiates Proactive Copy Operations to copy data from the wearing SSD to a spare drive, ensuring data integrity and continuity.

Proactive Copy Operations:

This proactive measure helps prevent data loss and maintains system performance by preparing for SSD replacement in advance.

Dell Midrange Storage References:

Dell Unity XT documentation provides detailed guidelines on SSD wear monitoring and the associated proactive measures.

Community forums and support resources from Dell Technologies offer additional insights into system maintenance and proactive data protection.