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Excellent Valid D-VPX-OE-A-24 Exam Camp Pdf - Reliable Source of D-VPX-OE-A-24 Exam

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EMC Dell VPLEX Operate Achievement Sample Questions (Q53-Q58):

NEW QUESTION # 53
A storage administrator has created a VPLEX distributed device. The administrator is performing application tests on the host utilizing the distributed virtual volumes. During testing, some of the write response times appear to be elongated.
What is a characteristic of distributed devices that explains this issue?

  • A. Writes need to be written to both clusters before sending a host acknowledgement.
  • B. Writes need to be journaled in the VPLEX Witness logging volumes before sending a host acknowledgement.
  • C. Writes need to be written locally to multiple VPLEX Directors before sending a host acknowledgement.
  • D. Writes need to be protected on the remote disk arrays only before sending a host acknowledgement.

Answer: A

Explanation:
When a VPLEX distributed device experiences elongated write response times, it is typically due to the characteristic of VPLEX that requires writes to be committed to backend storage on both clusters before an acknowledgement is sent to the host. This ensures data integrity and consistency across the distributed device but can lead to increased response times, especially if there is network congestion or latency issues between the clusters.
Here's a detailed explanation:
* Write I/O Commitment:For a VPLEX distributed device, any write I/O must be committed to backend (BE) storage on both the local and remote clusters1.
* Network Impact:If the inter-cluster communication network (FC/IP WAN) is experiencing congestion or high latency, it will increase the round-trip time of I/O packets, leading to performance issues and elongated write response times1.
* Performance Best Practices:VPLEX best practices suggest that the round-trip time (RTT) between clusters should not exceed 5 ms to maintain optimal performance, with an RTT of 1 ms recommended for campus-wide networks1.
* Troubleshooting Steps:To address such issues, administrators should check for network congestion indicators in the firmware logs and ensure that all WAN communication ports are operational and that SFPs have sufficient power1.
* Resolution:If the VPLEX is configured for FC metro and supported by Dell EMC, collecting switch logs and engaging Dell EMC support is advised.For IP metro configurations, validating the health of the IP network is crucial to identify the cause of congestion1.
By understanding this characteristic of VPLEX distributed devices, storage administrators can take appropriate measures to mitigate elongated write response times and maintain system performance.


NEW QUESTION # 54
A storage administrator wants to view additional performance metrics for their VPLEX cluster. The administrator runs the report create-monitors command to help withthis task.
For which components does this command create monitors?

  • A. Disks, initiators, and storage volumes
  • B. Disks, volumes, and hosts
  • C. Disks, ports, and volumes
  • D. Disks, storage views, and ports

Answer: C

Explanation:
The report create-monitors command in Dell VPLEX is used to create custom monitors that can track a variety of performance metrics for different components of the VPLEX cluster. The command allows administrators to set up monitors for disks, ports, and volumes, which are essential elements of the VPLEX storage architecture.
Here's a detailed explanation:
* Disks:Monitors for disks can track performance metrics such as I/O rates, latency, and throughput, which are critical for assessing the health and efficiency of the physical storage.
* Ports:Monitoring ports is crucial for understanding the performance of data transfer interfaces, including Fibre Channel and Ethernet ports, which facilitate communication and data movement within the VPLEX cluster and to external networks.
* Volumes:Volumes, particularly virtual volumes, are logical storage units that administrators often need to monitor closely for performance metrics like read/write operations and response times to ensure optimal data access and processing.
* Custom Monitor Creation:To create a custom monitor, an administrator would access the management server, use the VPLEX CLI, and implement commands to specify the name, period, statistics, and targets for the monitor1.
* Monitor Management:After creating a monitor, administrators can add a file sink to direct the output to a CSV file for analysis.This file contains the collected data and is stored on the management server under the /var/log/VPlex/cli folder1.
* Documentation Reference:For more detailed instructions and information on creating and managing monitors, administrators are encouraged to consult the VPLEX CLI and Admin Guides, which provide comprehensive guidance on these processes1.
By setting up these monitors, a storage administrator can gain valuable insights into the performance of their VPLEX cluster and make informed decisions to maintain or improve its efficiency and reliability.


NEW QUESTION # 55
A company has deployed a VPLEX Metro protecting two applications without Cluster Witness:
. App1 distributed virtual volumes are added to CG1, which has detach-rule set cluster-1 as winner
. App2 distributed virtual volumes are added to CG2, which has detach-rule set cluster-2 as winner What should be the consequence if there is a WAN COM failure for an extended period?

  • A. I/O for CG1 is detached at cluster -1; I/O is serviced at cluster-2I/O for CG2 is detached at cluster -2; I/O is serviced at cluster-1
  • B. I/O for CG1 is suspended at cluster -1; I/O is serviced at cluster-2I/O for CG2 is serviced at cluster -1; I/O is suspended at cluster-2
  • C. I/O for CG1 is suspended at cluster -1; I/O is serviced at cluster-2I/O for CG2 is serviced at cluster -2; I/O is suspended at cluster-1
  • D. I/O for CG1 is serviced at cluster -1; I/O is suspended at cluster-2I/O is serviced for CG2 at cluster -2; I/O is suspended at cluster-1

Answer: B

Explanation:
In a VPLEX Metro environment without a Cluster Witness, the detach rules set for consistency groups (CGs) dictate the behavior during a WAN COM failure. Here's what happens:
* WAN COM Failure: A WAN COM failure means that the communication link between the two clusters in a VPLEX Metro has been lost.
* Detach Rules: Detach rules are predefined actions that determine which cluster will continue to service I/O for a distributed virtual volume in the event of a communication failure.
* CG1 and CG2: For App1, CG1 has a detach rule set with cluster-1 as the winner, meaning if there's a WAN COM failure, cluster-1 will continue to service I/O for CG1, and I/O will be suspended at cluster-2. Conversely, for App2, CG2 has a detach rule set with cluster-2 as the winner, so cluster-2 will continue to service I/O for CG2, and I/O will be suspended at cluster-1.
* Consequence of Extended WAN COM Failure: If the WAN COM failure is extended, the detach rules will be invoked, and each cluster will service the I/O for its respective application based on the set rules. This means that CG1 will be active on cluster-1 and suspended on cluster-2, and CG2 will be active on cluster-2 and suspended on cluster-1.
* No Cluster Witness: Without a Cluster Witness, which usually arbitrates which cluster should remain active in case of a split-brain scenario, the detach rules are critical for maintaining data integrity and availability.
By setting appropriate detach rules, the company ensures that each application remains operational on one of the clusters, even during an extended WAN COM failure, thus maintaining availability according to the predetermined failover strategy.


NEW QUESTION # 56
What condition would prevent volume expansion?

  • A. Volume not belonging to a consistency group
  • B. Migration occurring on the volume
  • C. Metadata volume being backed up
  • D. Logging volume in re-synchronization state

Answer: B

Explanation:
Volume expansion in Dell VPLEX is a process that allows for increasing the size of a virtual volume.
However, certain conditions can prevent this operation from taking place:
* Migration Occurring on the Volume: If there is an ongoing migration process involving the volume, it cannot be expanded until the migration is complete.This is because the volume's data layout is being altered during migration, and any attempt to change its size could lead to data corruption or other issues1.
* Consistency Group Membership: Whether or not a volume belongs to a consistency group does not directly prevent volume expansion. Consistency groups in VPLEX areused to ensure write-order fidelity across multiple volumes but do not restrict the expansion of individual volumes within the group.
* Metadata Volume Backup: Backing up a metadata volume is a separate operation that does not interfere with the ability to expand a storage volume. Metadata backups are typically performed to preserve the configuration and state information of the VPLEX system.
* Logging Volume Re-synchronization: While a logging volume in a re-synchronization state indicates that there is an ongoing process to align data across clusters or devices, it does not inherently prevent the expansion of a storage volume.
Therefore, the condition that would prevent volume expansion is when there is a migration occurring on the volume (OA).


NEW QUESTION # 57
What determines which cluster will service I/O in the event of a WAN COM failure for a distributed device that is not a member of a consistency group?

  • A. Detach rule of the storage view
  • B. Rule set of the distributed device
  • C. Detach rule of the consistency group
  • D. VPLEX Witness

Answer: B


NEW QUESTION # 58
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