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D-VPX-DY-A-24 Lernressourcen - D-VPX-DY-A-24 Fragen Antworten

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EMC Dell VPLEX Deploy Achievement D-VPX-DY-A-24 Prüfungsfragen mit Lösungen (Q21-Q26):

21. Frage
Which type of statistics is used to track latencies, determine median, mode, percentiles, minimums, and maximums?

A. Readings
B. Monitors
C. Counters
D. Buckets

Antwort: D

Begründung:
In the context of performance monitoring, particularly for systems like Dell VPLEX, histograms are used to track latencies and display statistical data such as median, mode, percentiles, minimums, and maximums. The term "buckets" is often used to describe the segments within a histogram that categorize the latency data into ranges. Each bucket represents a range of latencies, and the number of events (or I/O operations) that fall into each latency range is counted and displayed.
* Histograms in Monitoring: Histograms provide a visual representation of how data is distributed across different ranges of values, which is particularly useful for understanding the performance characteristics of a system like VPLEX.
* Buckets Explained: Buckets within a histogram divide the entire range of collected data into discrete intervals. For latency tracking, these buckets might represent latency ranges such as 0-1 ms, 1-2 ms, etc.
* Latency Tracking: By collecting latency data in buckets, administrators can quickly identify the distribution of latencies over time, pinpointing whether most I/O operations are fast, slow, or somewhere in between.
* Minimums and Maximums: Histograms make it easy to see the minimum and maximum latencies experienced by the system, as well as the frequency of latencies within each bucket range.
* Performance Analysis: This method of collecting and analyzing performance statistics is crucial for performance tuning and capacity planning, as it helps administrators understand the behavior of their storage systems under different workloads.
In summary, "buckets" are the correct answer when referring to the segments within a histogram that are used to collect and categorize latency data for performance monitoring purposes in systems like Dell VPLEX.

22. Frage
A VPLEX Metro cluster is being installed for a company that is planning to create distributed volumes with
200 TB of storage. Based on this requirement, and consistent with
EMC best practices, what should be the minimum size for logging volumes at each cluster?

A. 10 GB
. 12.5 GB
B. 16.5 GB
C. 20 GB

Antwort: A

Begründung:
When configuring a VPLEX Metro cluster, especially for a company planning to create distributed volumes with a large amount of storage like 200 TB, it is essential to adhere to EMC best practices for the size of logging volumes.
* Purpose of Logging Volumes: Logging volumes in VPLEX are used to store write logs that ensure data integrity and consistency across distributed volumes. These logs play a critical role during recovery processes1.
* Size Considerations: The size of the logging volumes should be proportional to the amount of active data being written to ensure that all write operations are captured in the logs. For 200 TB of distributed storage, a minimum size of 10 GB for each logging volume is recommended to handle the logging requirements1.
* Configuration: The logging volumes should be configured on each cluster to provide redundancy and high availability. This means that both clusters in a VPLEX Metro configuration should have logging volumes of at least the minimum recommended size1.
* Best Practices: EMC best practices suggest that the logging volume should be sized appropriately to support the operational workload and to ensure that there is sufficient space to capture all write operations without any loss of data1.
* Verification and Monitoring: After setting up the logging volumes, it is important to monitor their utilization to ensure they are functioning correctly and to adjust their size if necessary based on the actual workload1.
In summary, consistent with EMC best practices, the minimum size for logging volumes at each cluster in a VPLEX Metro cluster being installed for creating distributed volumes with 200 TB of storage should be 10 GB. This size ensures that the logging volumes can adequately support the write logging requirements for the amount of storage being used.

23. Frage
During VPLEX installation, four 78 GB metadata volumes have to be assigned to the VPLEX back-end ports.
How are these volumes used?

A. Two are mirrored and used as the meta-volume.
Two are used in an alternating fashion as meta-volume backups.
B. One is used as the meta-volume.
Three are used in an alternating fashion as meta-volume backups.
C. Two are mirrored and used as the meta-volume.
Two are also mirrored and used as the meta-volume daily backup.
D. One is used as the meta-volume.
One is used as the meta-volume backup
Two are used as logging volumes when the clusters lose connectivity.

Antwort: A

Begründung:
During the VPLEX installation, metadata volumes play a critical role in the system's operation. Here's how the four 78 GB metadata volumes are utilized:
* Meta-Volume Configuration: Two of the metadata volumes are mirrored to create the active meta-volume. This mirroring provides redundancy, ensuring that metadata, which is essential for the operation of VPLEX, is protected against single points of failure1.
* Backup Meta-Volumes: The other two metadata volumes are used as backups for the meta-volume.
They are used in an alternating fashion, which means that they can be rotated to maintain a fresh and consistent backup of the meta-volume1.
* Importance of Metadata: The metadata in VPLEX contains information about the virtual volumes, mappings, and other configuration details that are crucial for the system's virtualization capabilities1.
* System Resilience: By having mirrored meta-volumes and alternating backup volumes, VPLEX ensures high availability and resilience, which is critical for maintaining continuous operations and data integrity1.
* Operational Continuity: In the event of a failure or corruption of the active meta-volume, VPLEX can quickly switch to one of the backup volumes, minimizing downtime and maintaining operational continuity1.
In summary, the four 78 GB metadata volumes assigned to the VPLEX back-end ports during installation are used to create a mirrored meta-volume and provide alternating backups, ensuring system resilience and data integrity.

24. Frage
What is the correct order of steps to migrate from an old array to a new one without disruption using VPLEX?

Antwort:

Begründung:

Explanation:

The correct order of steps to migrate from an old array to a new one without disruption using VPLEX is as follows:
* Connect the new storage array to VPLEX.
* VPLEX discovers the new array, and the admin creates migration target devices.
* The VPLEX admin initiates mobility job(s).
* VPLEX admin monitors the progress of the migration; I/O to the host continues.
* Once volumes on the new array are fully synchronized, the admin commits the migration.
* Connect New Storage Array: The first step involves physically connecting the new storage array to the VPLEX system and ensuring proper connectivity1.
* Discovery and Device Creation: VPLEX then discovers the new array. The administrator uses the VPLEX management interface to create the target devices that will receive the data from the old array1.
* Initiate Mobility Jobs: The administrator initiates mobility jobs using the VPLEX CLI or management interface. These jobs handle the data transfer from the old array's devices to the new array's devices1.
* Monitor Migration Progress: While the mobility jobs are running, the administrator monitors the progress. During this time, the host continues to perform I/O operations without disruption1.
* Commit Migration: After the data has been fully synchronized to the new array, the administrator commits the migration. This finalizes the transfer and allows the host to use the new array's devices as if they were the original ones1.
This process ensures a smooth and non-disruptive migration from an old storage array to a new one using VPLEX, maintaining continuous availability of applications and data.

25. Frage
Which command is used to display available statistics for monitoring VPLEX?

A. monitor collect
B. monitor stat-list
C. monitor create
D. monitor add-sink

Antwort: B

Begründung:
The command used to display available statistics for monitoring VPLEX is monitor stat-list. This command provides a list of all the statistics that can be monitored on the VPLEX system.
* Command Usage: The monitor stat-list command is executed in the VPLEX CLI (Command Line Interface). When run, it will display a list of all the statistics that are available for monitoring1.
* Monitoring Statistics: The statistics available for monitoring can include various performance metrics such as IOPS (Input/Output Operations Per Second), throughput, and latency. These metrics are crucial for assessing the health and performance of the VPLEX system1.
* Custom Monitors: In addition to the default system monitors, custom monitors can be created to track specific data. The monitor stat-list command helps in identifying which statistics can be included in these custom monitors1.
* Performance Analysis: By using the monitor stat-list command, administrators can determine which statistics are relevant for their performance analysis and can then create monitors to track those specific metrics1.
* Documentation Reference: For more information on the usage of the monitor stat-list command and other monitoring commands, administrators should refer to the VPLEX CLI and Administration Guides for the code level the VPLEX is running1.
In summary, the monitor stat-list command is used to display the available statistics for monitoring VPLEX, providing administrators with the information needed to set up and manage performance monitoring on the system.

26. Frage
......

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Rick Parsons Rick Parsons

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