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EMC Dell VPLEX Deploy Achievement Sample Questions (Q45-Q50):

NEW QUESTION # 45
How does VS6 improve internal cluster I/O over VS2?

A. VS6 directors use 40 Gbps InfiniBand Local COM connections
B. VS6 uses 16 Gbps FC connections to front-end hosts
C. VS6 utilizes an internal MMCS module for management
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 # 46
Connectivity has been restored after a WAN outage. The storage administrator of a VPLEX VS6 now wants to verify management connectivity between MMCS-A on Cluster-1 and MMCS-A on Cluster-2.
Which command can the administrator run to determine if the remote management IP is reachable?

A. 11 /engines/ ** /ports
B. vpn status
C. sudo /usr/sbin/ipsec statusall
D. connectivity validate-wan-com

Answer: B

Explanation:
After a WAN outage, to verify management connectivity between MMCS-A on Cluster-1 and MMCS-A on Cluster-2, the storage administrator should use the vpn status command. This command checks the status of the VPN tunnels that facilitate secure communication between the management servers and the Cluster Witness Server.
* Command Execution: The administrator should execute the vpn status command in the VPLEX CLI.
This command will provide information about the state of the VPN tunnels1.
* Interpreting Results: The output from the vpn status command will indicate whether the IPsec VPN tunnels are up and if the remote management servers are reachable. It will show the status of connectivity with both the management servers and the Cluster Witness Server1.
* VPN Tunnel Status: The command will show the status of the VPN tunnel between the management servers, which is crucial for the clusters to communicate and operate as a metro system1.
* Cluster Witness Server Connectivity: Additionally, the command will verify the VPN status between the management server and the Cluster Witness Server, ensuring that the witness can monitor the health and status of the clusters1.
* Troubleshooting: If the vpn status command indicates that the remote management IP is not reachable, further troubleshooting will be required to establish connectivity. This may involve checking network configurations, firewall settings, and ensuring that the VPN services are running properly1.
In summary, the vpn status command is used to determine if the remote management IP is reachable, providing a quick and effective way to verify management connectivity between VPLEX clusters after a WAN outage.

NEW QUESTION # 47
Which performance statistics are collected as histograms and used to track latencies to display minimums and maximums?

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

Answer: A

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 # 48
What is a consideration when performing batched data mobility jobs using the VPlexcli?

A. Allows for the user to migrate an extent to a smaller target if thin provisioned
B. Allows for the user to overwrite a device target with a configured virtual volume
C. Allows for more than 25 concurrent migrations
D. Allows only one type of data mobility job per plan

Answer: D

Explanation:
When performing batched data mobility jobs using the VPlexcli, a key consideration is that each batched mobility job plan can only contain one type of data mobility jB. This means that all the migrations within a single plan must be of the same type, such as all migrations being from one storage array to another or all being within the same array.
* Creating a Mobility Job Plan: When creating a batched data mobility job plan using the VPlexcli, you initiate a plan that will contain a series of individual migration jobs1.
* Job Type Consistency: Within this plan, all the jobs must be of the same type to ensure consistency and predictability in the execution of the jobs. This helps in managing resources and dependencies effectively1.
* Execution of the Plan: Once the plan is created and initiated, the VPlexcli will execute each job in the order they were added to the plan. The system ensures that the resources required for each job are available and that the jobs do not conflict with each other1.
* Monitoring and Completion: As the jobs are executed, their progress can be monitored through the VPlexcli. Upon completion of all jobs in the plan, the system will report the status and any issues encountered during the migrations1.
* Best Practices: It is recommended to follow best practices for data mobility using VPlexcli as outlined in the Dell VPLEX Deploy Achievement documents. This includes planning migrations carefully, understanding the types of jobs that can be batched together, and ensuring that the system is properly configured for the migrations1.
In summary, when performing batched data mobility jobs using the VPlexcli, it is important to remember that only one type of data mobility job is allowed per plan. This consideration is crucial for the successful execution and management of batched data mobility jobs in a VPLEX environment.

NEW QUESTION # 49
A RAID-C device has been built from a 100 GB extent and a 30 GB extent. How can this device be expanded?

A. Use concatenation by adding another extent to the device
B. RAID-C device cannot be expanded with unequal extent sizes
C. Add another RAID-C device to create a top-level device
D. Expand the 100 GB or 30 GB storage volume on the back-end array

Answer: A

Explanation:
To expand a RAID-C device that has been built from extents of unequal sizes, such as a 100 GB extent and a
30 GB extent, concatenation can be used. Concatenation allows for the addition of another extent to the existing RAID-C device, thereby increasing its overall size.
* Understanding RAID-C: RAID-C is a type of RAID configuration used in VPLEX that allows for concatenation, which is the process of linking multiple storage extents to create a larger logical unit1.
* Adding an Extent: To expand the RAID-C device, a new extent of the desired size can be added to the existing device. This new extent is concatenated to the end of the current extents, increasing the total capacity of the RAID-C device1.
* VPLEX CLI Commands: The expansion is performed using VPLEX CLI commands. The specific command to add an extent to a RAID-C device would be similar to the storage-volume expand command, which instructs the system to include the new extent in the RAID-C device1.
* Resizing Back-End Storage: If necessary, the back-end storage volumes (the physical storage on the array) that correspond to the extents may need to be resized to match the new configuration1.
* Verification: After the expansion, it's important to verify that the RAID-C device reflects the new size and that all extents are properly concatenated and functioning as expected1.
In summary, a RAID-C device built from extents of unequal sizes can be expanded by using concatenation to add another extent to the device. This method allows for flexibility in managing storage capacity within a VPLEX environment.

NEW QUESTION # 50
......

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