Ace Your D-VPX-DY-A-24 Storage Administrator Exam

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.

Context: The Dell VPLEX system allows for the expansion of virtual volumes to accommodate growing data storage needs without disrupting ongoing operations.

Initialization Process: When expanding storage volumes, the system undergoes initialization processes to integrate the new storage capacity effectively.

Concurrent Processes Limit: For virtual volumes built on RAID-1 or distributed RAID-1 devices, the maximum number of initialization processes that can run concurrently per cluster is 1000. This limit ensures optimal performance and resource management within the cluster.

Implications: If the limit of 1000 concurrent processes is reached, no new storage volume expansions can be initiated until some of the ongoing initialization processes are completed.

References:

Dell EMC Metro Node Administrator Guide

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.

To identify the port indicated by the black arrow, we can refer to the standard VPLEX director port WWN breakdown provided by Dell:

Director Identification: Determine whether the director is A or B. Director B’s WWN is always +1 of Director A’s number1.

Port Numbering: VPLEX director port WWNs are broken down as follows: 0x5001442 [num][seed][IOmodule][port number], where the [port number] is one of {0,1,2,3}1.

Front-End Ports: For VS2 hardware, the front-end ports are typically numbered 0, and the back-end ports are numbered 11.

Exhibit Analysis: If the exhibit shows the standard layout of a VPLEX system and the black arrow points to the first port on Director B, it would be the front-end port 01.

Verification: To confirm the identification, one would typically refer to the official Dell EMC VPLEX documentation for hardware installation and setup, which would provide clear labeling of each port1.

In summary, based on the standard VPLEX port numbering and layout, the port indicated by the black arrow in the exhibit is likely Director B - front-end port 0, assuming that the exhibit follows the standard orientation and labeling conventions.