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

NEW QUESTION # 53
What is an EMC best practice for connecting VPLEX to back-end arrays?

A. Each VPLEX director should have four active paths to every back-end array storage volume
B. One multiple switch fabric should be used for each VPLEX engine
C. Two active paths per VPLEX engine to any storage volume is optimal
D. Back-end connections should be distributed across one director

Answer: A

Explanation:
EMC recommends specific best practices for connecting VPLEX to back-end storage arrays to ensure high availability and optimal performance. One of these best practices is that each VPLEX director should have four active paths to every back-end array storage volume.
* Multiple Paths: Having multiple active paths from each VPLEX director to the storage volumes ensures that there is no single point of failure. If one path fails, the other paths can continue to provide connectivity1.
* Load Balancing: Multiple paths also allow for load balancing of I/O operations across the different paths, which can improve performance and reduce the risk of bottlenecks1.
* Path Redundancy: Path redundancy is crucial for maintaining continuous availability, especially in environments where the VPLEX is used for mission-critical applications1.
* Configuration: The configuration of the paths should be done in accordance with EMC's best practices, which include proper zoning and masking in the SAN environment1.
* Documentation: Detailed guidelines and best practices for VPLEX SAN connectivity, including back-end array connections, are available in EMC's documentation, which provides comprehensive instructions for setting up and managing these connections1.
In summary, EMC's best practice for connecting VPLEX to back-end arrays is to ensure that each VPLEX director has four active paths to every back-end array storage volume. This setup provides the necessary redundancy and performance for a robust and reliable storage environment.

NEW QUESTION # 54
What is a best practice when connecting a VPLEX Cluster-1 to VPLEX Cluster-2?

A. Create 32 zones between Cluster-1 and the Cluster-2 VPLEX cluster
B. Zone every Cluster-1 WAN port to every Cluster-2 WAN port in each fabric
C. Create 16 zones between Cluster-1 and the Cluster-2 VPLEX cluster
D. Zone every Cluster-1 director port to every Cluster-2 director port in each fabric

Answer: D

Explanation:
When connecting a VPLEX Cluster-1 to VPLEX Cluster-2, the best practice is to ensure that every director port in Cluster-1 is zoned to every director port in Cluster-2 within each fabric. This approach is recommended to maintain a robust and resilient storage network that can handle failover scenarios and provide continuous availability.
* Zoning Directors: Zoning is a SAN best practice that isolates traffic within the fabric to specific devices. By zoning every director port from one cluster to every director port in the other cluster, you ensure that there are multiple paths for communication, which enhances redundancy and fault tolerance1.
* Fabric Configuration: Each fabric should be configured separately to maintain isolation between the paths. This prevents a single point of failure from affecting all paths and allows for continued operation even if one fabric experiences issues1.
* Path Redundancy: With every director port zoned to its counterpart in the other cluster, there are multiple paths for data to travel. This redundancy is crucial for VPLEX Metro's high availability, as it allows for seamless failover between clusters1.
* Continuous Availability: VPLEX is designed for continuous availability, and proper zoning is key to achieving this. The zoning configuration should support VPLEX's ability to provide uninterrupted access to data, even in the event of hardware failures or maintenance activities1.
* Best Practices Documentation: Dell EMC provides detailed documentation on VPLEX implementation and best practices, including zoning recommendations. It is important to consult these documents when planning and implementing zoning for VPLEX clusters1.
In summary, the best practice for connecting VPLEX Cluster-1 to Cluster-2 is to zone every director port to every director port in each fabric, ensuring multiple paths for communication and enhancing the overall resilience of the storage network.

NEW QUESTION # 55
How does VS6 improve internal cluster I/O over VS2?

A. VS6 directors use 40 Gbps InfiniBand Local COM connections
B. VS6 utilizes an internal MMCS module for management
C. VS6 uses 16 Gbps FC connections to front-end hosts
D. VS6 uses 16 Gbps FC connections to back-end storage arrays

Answer: A

Explanation:
The VPLEX VS6 improves internal cluster I/O over the VS2 by utilizing 40 Gbps InfiniBand Local COM connections. This enhancement significantly increases the internal bandwidth available for communication between directors within a VPLEX cluster.
* InfiniBand Technology: InfiniBand is a high-speed networking technology that provides substantial bandwidth and low latency. By using 40 Gbps InfiniBand connections, the VS6 directors can communicate more data at faster rates compared to the older VS2 hardware1.
* Increased I/O Performance: The increased bandwidth from the 40 Gbps InfiniBand connections allows for higher I/O performance, which is particularly beneficial for workloads that require fast data transfer rates and low response times1.
* Scalability: The VS6's improved internal cluster I/O capabilities also contribute to its scalability, supporting larger configurations and more volumes, which is essential for growing enterprise environments1.
* Optimized for All-Flash Storage: The VS6 is optimized for all-flash storage, providing 2X IOPS at one-third the latency compared to the VS2, which is a direct result of the improved internal cluster I/O capabilities1.
* Future-Ready Infrastructure: The adoption of 40 Gbps InfiniBand Local COM connections positions
* the VS6 as a future-ready infrastructure that can handle the increasing demands of modern data centers1.
In summary, the VPLEX VS6's use of 40 Gbps InfiniBand Local COM connections is a key factor in its improved internal cluster I/O performance over the VS2, offering higher bandwidth and lower latency for demanding enterprise applications.

NEW QUESTION # 56
Which type of volume is subjected to high levels of I/O only during a WAN COM failure?

A. Distributed volume
B. Logging volume
C. Virtual volume
D. Metadata 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 # 57
When are the front-end ports enabled during a VPLEX installation?

A. After exposing the storage to the hosts
B. Before creating the metadata volumes and backup
C. Before launching the VPLEX EZ-Setup wizard
D. After creating the metadata volumes and backup

Answer: D

Explanation:
During a VPLEX installation, the front-end ports are enabled after the metadata volumes and backup have been created. This sequence ensures that the system's metadata, which is crucial for the operation of VPLEX, is secured before the storage is exposed to the hosts.
* Metadata Volumes Creation: The first step in the VPLEX installation process involves creating
* metadata volumes. These volumes store configuration and operational data necessary for VPLEX to manage the virtualized storage environment1.
* Metadata Backup: After the metadata volumes are created, it is essential to back up this data. The backup serves as a safeguard against data loss and is a critical step before enabling the front-end ports1.
* Enabling Front-End Ports: Once the metadata is secured, the front-end ports can be enabled. These ports are used for host connectivity, allowing hosts to access the virtual volumes presented by VPLEX1.
* Exposing Storage to Hosts: With the front-end ports enabled, the storage can then be exposed to the hosts. This step involves presenting the virtual volumes to the hosts through the front-end ports1.
* Final Configuration: The final configuration steps may include zoning, LUN masking, and setting up host access to the VPLEX virtual volumes. These steps are completed after the front-end ports are enabled and the storage is exposed1.
In summary, the front-end ports are enabled during a VPLEX installation after the metadata volumes and backup have been created, which is reflected in option D. This ensures that the system metadata is protected and available before the storage is made accessible to the hosts.

NEW QUESTION # 58
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