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Free PDF EMC - D-VPX-OE-A-24 Fantastic Valid Test Guide

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EMC Dell VPLEX Operate Achievement Sample Questions (Q44-Q49):

NEW QUESTION # 44
Which VPLEX model is recommended for VPLEX for All Flash (VAF)?

A. VS6 only
B. VS2 only
C. VS1
D. VS2 and VS6

Answer: D

NEW QUESTION # 45
Why is it EMC best practice that each back-end LUN has a connection to all the A-directors and to all the B-directors in the VPLEX cluster?

A. Prevents data unavailability during a non-disruptive upgrade
B. Ensures writes are mirrored on director local cache
C. Reduces the number of ITLs
D. Optimizes global read cache

Answer: A

Explanation:
It is EMC best practice to ensure that each back-end LUN has a connection to all the A-directors and to all the B-directors in the VPLEX cluster to prevent data unavailability during a non-disruptive upgrade. Here's why:
* Non-Disruptive Upgrades: VPLEX allows for non-disruptive upgrades, meaning that system updates and maintenance can occur without impacting data availability or application performance1.
* Director Connectivity: By connecting each back-end LUN to all A-directors and B-directors, VPLEX ensures that there are multiple paths for data access.If one director is being upgraded or is offline, the other directors can continue to provide access to the LUNs1.
* High Availability: This connectivity model supports VPLEX's high availability architecture, allowing for continuous operations even during maintenance activities1.
* Redundancy: The practice of connecting LUNs to all directors provides redundancy, ensuring that there is no single point of failure that could lead to data unavailability1.
* Best Practice: EMC recommends this approach as a best practice to maximize the uptime and resilience of the storage environment, which is critical for mission-critical applications that require constant data access1.
By following this best practice, organizations can leverage VPLEX's capabilities to maintain data availability and ensure business continuity, even when system upgrades or director maintenance is required.

NEW QUESTION # 46

Refer to the exhibit.
A virtual volume created on a distributed device is experiencing performance problems. The virtual volume is in a storage view in Cluster-1.
What could be the issue?

A. Device mobility jobs are moving data across the WAN COM
B. A WAN COM failure has occurred
C. There is storage volume contention on Cluster-2
D. Distributed device I/O is exceeding WAN COM bandwidth

Answer: D

Explanation:
The graph provided in the exhibit shows a high level of 'Sent' bandwidth usage, which remains consistently near the upper limit of the chart. This suggests that there is a significant amount of data being sent over the WAN link. In a Dell VPLEX environment, if virtual volumes created on distributed devices experience performance problems, one possible reason could be that I/O demands exceed available WAN COM (WAN Communication) bandwidth.
Here's a detailed explanation:
* High 'Sent' Bandwidth Usage: The graph indicates that the 'Sent' bandwidth is consistently high, nearing the chart's maximum capacity.
* Impact on Performance: When the I/O of a distributed device exceeds the available WAN COM bandwidth, it can cause a bottleneck, resulting in performance issues such as increased latency or slower response times for write operations.
* VPLEX Distributed Architecture: In a VPLEX distributed environment, data must be written to both clusters before an acknowledgment is sent to the host. If the WAN link is saturated, this process is
* delayed, affecting overall performance.
* Monitoring Tools: VPLEX provides monitoring tools that can help identify such issues. The graph in the exhibit likely comes from such a tool, illustrating the system-wide WAN link usage and pinpointing potential performance bottlenecks.
* Resolution: To resolve this issue, a storage administrator might need to consider increasing the WAN COM bandwidth, optimizing the data flow, or redistributing the workload to reduce the strain on the WAN link.
References:
* Dell EMC VPLEX documentation regarding system performance considerations discusses factors affecting virtual volume performance, including network constraints.
* Best practices for VPLEX suggest monitoring WAN link usage and ensuring it aligns with the expected performance levels for distributed devices.
By analyzing the WAN COM bandwidth usage and understanding its impact on distributed device performance, storage administrators can take appropriate actions to mitigate any issues and maintain optimal performance levels.

NEW QUESTION # 47
What is a consideration when using VPLEX RecoverPoint enabled consistency groups?

A. Local copy volumes and production volumes must reside in separate consistency groups.
B. Local virtual volumes and distributed virtual volumes can be in the same consistency group.
C. Repository volume and journal volumes must be in different consistency groups.
D. Production and local copy journals must be in different consistency groups.

Answer: D

Explanation:
When using VPLEX with RecoverPoint enabled consistency groups, it's important to consider how journals are managed:
* Production Journals: These are used by the production volumes for logging write I/Os before they are replicated to the remote site or local copy.
* Local Copy Journals: These are used by the local copy volumes for the same purpose as production journals but are specific to the local copies.
* Separation of Journals: To ensure proper replication and recovery processes, production and local copy journals must be kept in separate consistency groups.This separation is crucial for maintaining the
* integrity of the replication and avoiding conflicts between production and local copy operations1.
* RecoverPoint Configuration: In a VPLEX environment, RecoverPoint provides continuous data protection and replication.It is configured to work with VPLEX consistency groups to ensure that all writes are captured and can be recovered in case of a failure1.
* Best Practices: Dell's best practices for VPLEX RecoverPoint configurations recommend this separation of journals to ensure that the system can handle failover scenarios correctly and that data is not lost or corrupted1.
By following this consideration, storage administrators can ensure that their VPLEX RecoverPoint environment is configured for optimal data protection and disaster recovery readiness.

NEW QUESTION # 48
LUNs belonging to an ESXi cluster were encapsulated behind VPLEX. What information must be shared with the ESXi administrator so that they can re-discover the datastore and the RDM LUNs?

A. Virtual volume VPD
B. WWN:WWPN
C. UUID of back-end LUN
D. VML ID

Answer: A

Explanation:
When LUNs belonging to an ESXi cluster are encapsulated behind VPLEX, the information that must be shared with the ESXi administrator for them to re-discover the datastore and the RDM LUNs is the Virtual Volume VPD (Vital Product Data).
* Virtual Volume VPD: The VPD for a virtual volume contains essential information about the volume, such as its identifier, which is used by the ESXi host to recognize and differentiate the volume1.
* Re-Discovery Process: After encapsulation, the ESXi administrator will need to perform a rescan of the storage adapters on the ESXi hosts.During this rescan, the hosts use the VPD information to identify the newly encapsulated LUNs and re-discover the associated datastore and RDM LUNs1.
* Datastore and RDM LUNs: Datastores are storage containers that hold virtual machine files, while RDM (Raw Device Mapping) LUNs allow a virtual machine to directly access a storage device.Both rely on unique identifiers to ensure correct access and operation within the ESXi environment1.
* Sharing Information: The VPLEX administrator should provide the VPD information to the ESXi administrator, typically after the encapsulation process is complete and before the ESXi storage rescan is initiated1.
* Ensuring Access: By sharing the correct VPD information, the ESXi administrator can ensure that the ESXi cluster correctly identifies and regains access to the encapsulated LUNs, maintaining the continuity of services and data availability1.
The sharing of the Virtual Volume VPD is a critical step in the process of LUN encapsulation behind VPLEX, ensuring that the ESXi cluster can successfully re-discover and utilize the datastore and RDM LUNs.

NEW QUESTION # 49
......

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