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

NEW QUESTION # 53
In a VPLEX Metro, what factor has a direct impact on VPLEX performance with respect to WAN bandwidth?

  • A. Read rate on distributed volumes
  • B. Write rate on distributed volumes
  • C. Thin pool rebalances
  • D. Raid rebuild on array

Answer: B

Explanation:
In a VPLEX Metro environment, the write rate on distributed volumes has a direct impact on VPLEX performance with respect to WAN bandwidth. Here's how:
* Distributed Volumes: Distributed volumes in VPLEX Metro span across two geographically separated clusters and are designed to provide continuous availability and data mobility1.
* Write Operations: Write operations on distributed volumes require data to be written to both clusters before an acknowledgment is sent back to the host.This ensures data consistency across both sites2.
* WAN Bandwidth: The Wide Area Network (WAN) bandwidth between the two clusters is a critical factor in the performance of these write operations.If the WAN bandwidth is insufficient, it can lead to increased latency and reduced throughput3.
* Performance Impact: With only half the available WAN-COM paths, VPLEX can exceed bandwidth limitations on the existing WAN-COM paths, causing severe latency impacting the remote writes of distributed devices3.
* Best Practices: VPLEX best practices indicate that the round-trip time (RTT) between VPLEX clusters shouldn't exceed 5 ms to provide the best performance, and an RTT of 1 ms is recommended for a campus-wide network2.
By managing the write rate on distributed volumes and ensuring adequate WAN bandwidth, VPLEX Metro can maintain high performance and meet the required service levels for data availability and accessibility.


NEW QUESTION # 54
A new VPLEX system has been installed that uses ESRS. The firewall administrator has opened ports 25,
9010, and 5901 between VPLEX and ESRS. A support ticket is
logged. While trying to troubleshoot, the technical support engineer cannot access the GUI of VPLEX.
Which port needs to be opened on the firewall?

  • A. 0
  • B. 1
  • C. 2
  • D. 3

Answer: A

Explanation:
When setting up a VPLEX system that uses ESRS (EMC Secure Remote Services), it is essential to ensure that the correct ports are open to allow for various types of communication, including access to the VPLEX GUI.
The port that needs to be opened on the firewall to allow access to the VPLEX GUI is port 443.
* Port 443: This port is commonly used for HTTPS traffic, which is the protocol used for secure web communications.The VPLEX GUI is accessed over a web browser using HTTPS, hence the need for port 443 to be open1.
* Firewall Configuration: The firewall administrator must configure the firewall to allow inbound and outbound traffic on port 443 to the VPLEX system's IP address.This ensures that the technical support engineer and other users can access the VPLEX GUI through a secure connection1.
* Troubleshooting Access Issues: If the technical support engineer cannot access the VPLEX GUI, one of the first steps in troubleshooting is to check the firewall settings to confirm that the necessary ports, including port 443, are open1.
* ESRS Communication: While ports 25, 9010, and 5901 are important for ESRS communication and other services, they do not facilitate access to the VPLEX GUI.Port 25 is typically used for SMTP email services, port 9010 may be used for internal services, and port 5901 could be used for VNC or other remote access protocols1.
* Secure Access: Opening port 443 not only allows access to the VPLEX GUI but also ensures that the communication is encrypted and secure, protecting sensitive data and system configurations1.
By opening port 443 on the firewall, the company ensures secure and reliable access to the VPLEX GUI for administration, monitoring, and troubleshooting purposes.


NEW QUESTION # 55
What is the correct order of steps to migrate from an old array to a new one without disruption using VPLEX?

Answer:

Explanation:

Explanation:


The correct order of steps to migrate from an old array to a new one without disruption using VPLEX is:
* VPLEX discovers the new array and the admin creates migration target devices.
* VPLEX admin initiates mobility job(s).
* Once volumes on the new array are fully synchronized, the admin commits the migration.
* VPLEX admin monitors progress of the migration; I/O to host continues.
* Connect new storage array to VPLEX.
* Discovery and Creation: The initial step involves VPLEX identifying the presence of a new storage array within its environment. Following this discovery, a system administrator is responsible for setting up migration target devices on this newly recognized array.
* Initiation of Mobility Jobs: Subsequently, a system administrator must initiate mobility jobs through the VPLEX management interface, which facilitates data movement from the existing source storage to the target devices on the new array.
* Synchronization and Commitment: After initiating mobility jobs, data synchronization between source and target arrays begins automatically. Once synchronization reaches completion, indicating that both arrays have identical data sets, an administrator must commit to finalizing this stage of migration.
* Monitoring Migration Progress: Throughout this process, it's crucial for an administrator to monitor ongoing operations ensuring that input/output operations continue uninterrupted for hosts accessing data during transition phases.
* Connecting New Array: The final step involves integrating the newly populated storage array into production by connecting it with VPLEX systems thus completing migration.


NEW QUESTION # 56
What is the maximum number of virtual volumes that can be placed into a single consistency group?

  • A. 0
  • B. 1
  • C. 2
  • D. 3

Answer: A

Explanation:
The maximum number of virtual volumes that can be placed into a single consistency group in a Dell VPLEX environment is800. This limit is set to ensure the manageability and performance of the consistency group within the VPLEX system.
Here's a detailed explanation:
* Consistency Group Capacity:A consistency group in VPLEX is a collection of virtual volumes that are managed together to maintain write-order fidelity, which is crucial for applications requiring strong consistency guarantees.
* Limit Rationale:The limit of 800 virtual volumes is determined based on the VPLEX system's ability to handle the overhead associated with managing a large number of volumes in a consistency group, including the coordination of writes and snapshots.
* Operational Management:By capping the number of virtual volumes in a consistency group, VPLEX ensures that the group can be managed effectively without compromising the performance of the storage system.
* Documentation Reference:The Dell VPLEX Operate Achievement documents outline the specifications and limitations of VPLEX systems, including the details of consistency group capacities1.
* Best Practices:Administrators are advised to follow best practices and guidelines provided by Dell when configuring and managing consistency groups to avoid exceeding the recommended limits and to ensure optimal system performance.
It's important for storage administrators to be aware of these limitations when planning and implementing VPLEX storage solutions to ensure they are operating within the supported configurations.


NEW QUESTION # 57
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, storage views, and ports
  • C. Disks, volumes, and hosts
  • D. Disks, ports, and volumes

Answer: D

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 # 58
......

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