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EMC Dell VPLEX Deploy Achievement Sample Questions (Q54-Q59):

NEW QUESTION # 54
Which performance statistics are collected as histograms and used to track latencies to display minimums and maximums?

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

Answer: D

Explanation:
In the context of performance monitoring, particularly for systems like Dell VPLEX, histograms are used to track latencies and display minimums, maximums, and other statistical data. 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 displayed1.
* 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 VPLEX1.
* 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, etc1.
* 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 between1.
* 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 range1.
* 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 workloads1.
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.

NEW QUESTION # 55
What are characteristics of a storage view?

A. An initiator can only be in multiple storage view
VPLEX FE port can be in multiple storage views
Each initiator and FE port pair must be in different storage views
B. An initiator can only be in one storage view
VPLEX FE port can be in multiple storage views
Each initiator and FE port pair can be in different storage views
C. An initiator can be in multiple storage views
VPLEX FE port can be in multiple storage views
Each initiator and FE port pair can only be in one storage view
D. An initiator can be in multiple storage views
VPLEX FE port can only be in one storage view
Each initiator and FE port pair can only be in one storage view

Answer: C

Explanation:
A storage view in Dell VPLEX is a construct that defines the visibility and access control of storage resources for hosts connected to the VPLEX system. The characteristics of a storage view are crucial for ensuring proper access and management of storage resources.
* Initiator Access: An initiator, which is typically a host bus adapter (HBA) on a server, can be part of multiple storage views. This allows a single server to access different storage resources that may be segregated for organizational, performance, or security reasons1.
* VPLEX FE Ports: VPLEX Front-End (FE) ports can be included in multiple storage views. This design allows for flexibility in connecting multiple hosts to various storage resources through the same FE port1.
* Initiator and FE Port Pairing: While an initiator can be in multiple storage views and a VPLEX FE port can be part of multiple storage views, each specific initiator and FE port pair can only be in one storage view. This restriction ensures that a unique path is maintained between a host and its storage resources, which is important for managing access and avoiding conflicts1.
* Storage View Configuration: When configuring a storage view, it is essential to correctly map the initiators to the VPLEX FE ports and assign the appropriate virtual volumes. This setup defines which hosts can access which storage volumes through which paths1.
* Best Practices: It is recommended to follow Dell's best practices for VPLEX storage views to ensure optimal performance, security, and manageability. These practices include proper zoning, LUN masking, and storage view management as outlined in Dell VPLEX documentation1.
In summary, the verified characteristics of a storage view in a Dell VPLEX environment are that an initiator can be in multiple storage views, a VPLEX FE port can be in multiple storage views, but each initiator and FE port pair can only be in one storage view. This configuration ensures that storage resources are properly allocated and managed within the VPLEX system.

NEW QUESTION # 56
Which command can be used to create a distributed device from specified local devices?

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

Answer: B

Explanation:
To create a distributed device from specified local devices in a Dell VPLEX environment, the command used is ds dd create. This command is part of the VPLEX CLI and stands for "distributed storage - distributed device create".
* Identify Local Devices: Before creating a distributed device, you need to identify the local devices that will be part of the distributed device. These are typically volumes that are already provisioned and claimed by the VPLEX system1.
* Use the ds dd create Command: Execute the ds dd create command in the VPLEX CLI, specifying the local devices that you want to include in the distributed device. The syntax for the command includes the names of the local devices and the name you want to assign to the distributed device1.
* Command Execution: The command will initiate the creation of the distributed device, which involves pairing the specified local devices across the VPLEX clusters to create a single distributed volume that spans both clusters1.
* Verification: After running the command, verify that the distributed device has been created successfully by using the ll /distributed-storage/distributed-devices/ command, which lists all the distributed devices in the system1.
* Best Practices: It is important to follow the best practices for creating distributed devices as outlined in the Dell VPLEX Deploy Achievement documents. This includes ensuring that the local devices are properly configured and that the VPLEX clusters are in a healthy state before creating the distributed device1.
In summary, the ds dd create command is used to create a distributed device from specified local devices in a Dell VPLEX environment. This command is a fundamental part of managing distributed storage within VPLEX and is essential for achieving high availability and data mobility across clusters.

NEW QUESTION # 57
How does VS6 improve internal cluster I/O over VS2?

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

Answer: C

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 # 58
What is a benefit of using AppSync with VPLEX and XtremIO?

A. Take application consistent snapshots on the VPLEX
B. Take application consistent snapshots on XtremlO with VPLEX in the data path
C. Take bookmarks on XtremIO with VPLEX in the data path
D. Manage MetroPoint with VPLEX in the data path

Answer: B

Explanation:
AppSync is a software that allows for application-consistent snapshots, which are crucial for ensuring that data is in a consistent state when a snapshot is taken. This is particularly important for applications that require a consistent set of data, like databases.
* Application-Consistent Snapshots: AppSync enables the creation of application-consistent snapshots on XtremIO storage arrays. This means that the snapshots reflect the exact state of the application at the point in time when the snapshot was taken1.
* Integration with VPLEX: When used with VPLEX, AppSync allows for these application-consistent snapshots to be taken even when the storage is virtualized behind VPLEX. This ensures that the benefits of both VPLEX virtualization and XtremIO's powerful snapshot capabilities can be utilized together1.
* Benefits for Application Owners: For application owners, this integration means that they can have confidence in the consistency of their data when using these snapshots for purposes such as development, testing, or backup and recovery1.
* Operational Efficiency: The ability to take application-consistent snapshots on XtremIO with VPLEX in the data path simplifies operations. It allows for efficient use of storage resources and reduces the complexity of managing snapshots across different storage systems1.
* Use Cases: This capability is particularly beneficial for environments running critical applications such as databases, where having consistent snapshots is essential for tasks like replication, data recovery, and testing1.
In summary, the key benefit of using AppSync with VPLEX and XtremIO is the ability to take application-consistent snapshots on XtremIO while VPLEX is in the data path, providing a reliable and efficient way to manage snapshots for critical applications.

NEW QUESTION # 59
......

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