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EMC Dell VPLEX Operate Achievement Sample Questions (Q40-Q45):

NEW QUESTION # 40
Using the Storage Volume expansion method for virtual volumes built on RAID-1 or distributed RAID-1 devices, what is the maximum number of initialization processes that can run concurrently, per cluster?

  • A. 0
  • B. 1
  • C. 2
  • D. 3

Answer: C


NEW QUESTION # 41
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 # 42
What is the correct order of steps to create a virtual volume?

Answer:

Explanation:

Explanation:


The correct order of steps to create a virtual volume is:
* Claim storage volume
* Create extent
* Create device
* Create virtual volume
* Claim Storage Volume: The first step involves claiming a storage volume from the underlying storage array. This is where you identify and allocate the physical storage that will be used.
* Create Extent: Once the storage volume is claimed, the next step is to create an extent. An extent is a specific range of block addresses within a storage volume.
* Create Device: After creating an extent, you then create a device. A device in VPLEX terminology is a logical representation of storage that can be used by hosts.
* Create Virtual Volume: The final step is to create a virtual volume from the device. A virtual volume is what is presented to hosts; it's the logical unit that they will access for storage.
This process ensures that storage is properly allocated and managed within the VPLEX environment, allowing for flexibility and efficiency in storage utilization.
For detailed procedures and best practices, it's recommended to consult the official Dell VPLEX documentation and training materials, which provide in-depth guidance on managing and configuring VPLEX systems.


NEW QUESTION # 43
Which command collects the most recent performance statistics from all VPLEX directors?

  • A. monitor collect
  • B. SNMPGET
  • C. SNMPGETBULK
  • D. monitor stat-list

Answer: C

Explanation:
The command that collects the most recent performance statistics from all VPLEX directors is SNMPGETBULK. This command is part of the SNMP (Simple Network Management Protocol) suite, which is used for collecting information and managing network devices.
* SNMPGETBULK Command: The SNMPGETBULK command retrieves bulk data from SNMP-enabled devices.It is designed to efficiently collect multiple pieces of information in a single request, making it suitable for gathering performance statistics from multiple directors1.
* Usage in VPLEX: In the context of Dell VPLEX, the SNMPGETBULK command can be used to query the directors for their most recent performance data. This data can include metrics such as I/O rates, latency, cache usage, and other vital statistics.
* Performance Monitoring: Collecting performance statistics is crucial for monitoring the health and efficiency of the VPLEX system. It helps administrators identify potential issues and optimize the system's performance.
* SNMP Configuration: To use the SNMPGETBULK command, SNMP must be configured on the VPLEX system, and the appropriate community strings and access permissions must be set up.
* Other Commands: While the monitor stat-list command lists available statistics and the monitor collect command collects performance data for a specific monitor, the SNMPGETBULK command is specifically used for bulk data retrieval across all directors.
By utilizing the SNMPGETBULK command, administrators can effectively gather comprehensive performance data from all VPLEX directors, aiding in the management and optimization of the storage environment.


NEW QUESTION # 44
What happens to global cache size if a director fails and is removed from the cluster?

  • A. Increases
  • B. Remains as-is
  • C. Decreases
  • D. Suspends

Answer: C

Explanation:
When a director fails and is removed from a VPLEX cluster, the global cache size decreases. This is because each director contributes to the total global cache available in the VPLEX cluster. Here's the explanation:
* Global Cache: The global cache in a VPLEX system is a shared resource that is used by all directors in the cluster to cache data for improved performance1.
* Director Contribution: Each director within the VPLEX cluster has its own local cache, which collectively forms the global cache.When a director is operational, its cache is part of the global cache pool1.
* Director Failure: If a director fails, its cache is no longer available to the cluster.As a result, the total size of the global cache is reduced by the amount that was contributed by the failed director1.
* Removal from Cluster: When the failed director is physically removed from the cluster, its cache is permanently removed from the global cache pool, resulting in a decrease in the total global cache size1.
* Impact on Performance: The reduction in global cache size may impact the performance of the VPLEX system, as there is less cache available for data storage and retrieval operations1.
* System Architecture: VPLEX architecture allows for multiple director failures without loss of access to data down to a single director, but the global cache size will decrease with each director failure1.
By understanding the role of each director's cache in contributing to the global cache, administrators can anticipate the effects of director failures on the overall performance of the VPLEX system.


NEW QUESTION # 45
......

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