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EMC Dell VPLEX Deploy Achievement Sample Questions (Q31-Q36):

NEW QUESTION # 31
Which type of volume is subjected to high levels of I/O only during a WAN COM failure?

A. Metadata volume
B. Logging volume
C. Virtual volume
D. Distributed volume

Answer: B

Explanation:
Questions no: High I/O volume type during WAN COM failure
Verified answer:B. Logging volume
Step by Step Comprehensive Detailed Explanation with References:During a WAN COM failure in a VPLEX Metro environment, logging volumes are subjected to high levels of I/O. This is because the logging volumes are used to store write logs that ensure data integrity and consistency across distributed volumes.
These logs play a critical role during recovery processes, especially when there is a communication failure between clusters.
* Role of Logging Volumes: Logging volumes in VPLEX are designed to capture write operations that cannot be immediately mirrored across the clusters due to network issues or WAN COM failures1.
* WAN COM Failure: When a WAN COM failure occurs, the VPLEX system continues to write to the local logging volumes to ensure no data loss. Once the WAN COM link is restored, the logs are used to synchronize the data across the clusters1.
* High I/O Levels: The high levels of I/O on the logging volumes during a WAN COM failure are due to the accumulation of write operations that need to be logged until the link is restored and the data can be synchronized1.
* Recovery Process: After the WAN COM link is restored, the VPLEX system uses the data in the logging volumes to rebuild and synchronize the distributed volumes, ensuring data consistency and integrity1.
* Best Practices: EMC best practices recommend monitoring the health and performance of logging volumes, especially during WAN COM failures, to ensure they can handle the increased I/O load and maintain system performance1.
In summary, logging volumes experience high levels of I/O only during a WAN COM failure as they are responsible for capturing and storing write operations until the communication between clusters can be re-established and data synchronization can occur.

NEW QUESTION # 32
Which command can be used to create a distributed device from specified local devices?

A. storage-tool compose
B. virtual-volume create
C. storage-volume compose
D. ds dd create

Answer: D

NEW QUESTION # 33
How much cache is available in a VPLEX VS2 dual engine setup?

A. 288 GB
B. 128 GB
C. 144 GB
D. 72 GB

Answer: A

Explanation:
In a VPLEX VS2 dual engine setup, each engine is fixed at 72GB of cache, with 36GB per director. Since a dual engine setup contains two engines, the total available cache would be:
72 GB (per engine) imes 2 (engines) = 144 GB72 GB (per engine)×2 (engines)=144 GB However, as each engine contains two directors, and each director has 36GB of cache, the total cache available in a dual engine setup would be:
36 GB (per director) imes 4 (directors) = 144 GB36 GB (per director)×4 (directors)=144 GB Therefore, the total cache available in a VPLEX VS2 dual engine setup is 144 GB1.

NEW QUESTION # 34
Which Management Server command shows the overall VPLEX status?

A. cluster status
B. ndu pre-check
C. cluster summary
D. VPLEXPlatformHealthCheck

Answer: A

Explanation:
The command that shows the overall VPLEX status is cluster status. This command provides a comprehensive view of the health and status of the VPLEX cluster.
* Command Usage: The cluster status command is executed in the VPLEX CLI (Command Line Interface). When run, it will display the status of the VPLEX cluster, including the health of the directors, connectivity, and any issues that may be affecting the system1.
* Overall Status: The output from the cluster status command includes information about the operational state of the cluster, such as the status of the storage volumes, the inter-cluster communication, and the performance metrics1.
* Health Check: This command is often used as a quick health check to ensure that the VPLEX system is functioning correctly and to identify any potential issues that need to be addressed1.
* Monitoring and Troubleshooting: The cluster status command is a valuable tool for monitoring the VPLEX system and for troubleshooting any problems that may arise1.
* Documentation Reference: For more information on the usage of the cluster status command and other management server commands, administrators should refer to the VPLEX CLI and Administration Guides for the code level the VPLEX is running1.
In summary, the cluster status command is used to display the overall status of the VPLEX system, providing administrators with a quick and effective way to monitor the health and performance of the cluster.

NEW QUESTION # 35
Using the Storage Volume expansion method for virtual volumes built on RAID-1 or distributed RAID-1 devices, what is the maximum number of initialization processes that can run concurrently, per cluster?

A. 0
B. 1
C. 2
D. 3

Answer: C

Explanation:
* Context: The Dell VPLEX system allows for the expansion of virtual volumes to accommodate growing data storage needs without disrupting ongoing operations.
* Initialization Process: When expanding storage volumes, the system undergoes initialization processes to integrate the new storage capacity effectively.
* Concurrent Processes Limit: For virtual volumes built on RAID-1 or distributed RAID-1 devices, the maximum number of initialization processes that can run concurrently per cluster is 1000. This limit ensures optimal performance and resource management within the cluster.
* Implications: If the limit of 1000 concurrent processes is reached, no new storage volume expansions can be initiated until some of the ongoing initialization processes are completed.
References:
* Dell EMC Metro Node Administrator Guide

NEW QUESTION # 36
......

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EMC Dell VPLEX Deploy Achievement Sample Questions (Q31-Q36):

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