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EMC Dell VPLEX Operate Achievement Sample Questions (Q60-Q65):

NEW QUESTION # 60
What happens to global cache size if a director fails and is removed from the cluster?

A. Remains as-is
B. Increases
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 # 61
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 # 62
Which command collects the most recent performance statistics from all VPLEX directors?

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

Answer: D

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 # 63

Refer to the exhibit.
Which displayed storage volume is available to be used for the creation of an extent?

A. 0
B. 1
C. 2
D. 3

Answer: D

Explanation:
Based on the information provided in the image, here is the explanation:
* Storage Volume 1 (OB): This volume is listed with a capacity of 79.99 GB, health status OK, and status OK. Its use is indicated as 'meta-data', which typically means it is reserved for system or metadata use and not available for creating extents.
* Storage Volume 2 (OA): This volume has a capacity of 6.00 GB, health status OK, and status OK. Its use is indicated as 'unclaimed', which suggests that it has not been allocated for any specific purpose yet and could potentially be used for creating an extent.
* Storage Volume 3 (OD): This volume also has a capacity of 6.00 GB, health status OK, and status OK.
However, its use is indicated as 'claimed', meaning it has already been allocated and is not available for creating new extents.
* Storage Volume 4 (OC): The final volume has a capacity of 27.00 GB, health status OK, and status OK. Its use is indicated as 'used', which implies that it is currently in use and not available for creating new extents.
Based on the above analysis, the storage volume that is available to be used for the creation of an extent is Storage Volume 2 (OA). It is the only volume marked as 'unclaimed' and therefore available for new configurations such as creating extents.

NEW QUESTION # 64
Which type of mobility is used to move data to a remote cluster in a VPLEX Metro?

A. Device
Virtual volume
B. MetroPoint
C. Extent

Answer: A

Explanation:
In a VPLEX Metro environment, the type of mobility used to move data to a remote cluster is known as device mobility. This process involves the migration of virtual volumes that are backed by VPLEX devices across the two clusters that make up the VPLEX Metro.
Here's a detailed explanation:
* Device Mobility: Device mobility refers to the capability of VPLEX to move a device, which is a logical representation of storage, from one cluster to another within a VPLEX Metro configuration1.
* VPLEX Metro: VPLEX Metro is a configuration that allows for synchronous data replication and accessibility between two geographically separated clusters.It provides continuous availability and non-disruptive data mobility1.
* Migration Process: The migration of data in a VPLEX Metro involves several steps, starting with the creation of a mobility job, followed by the actual data movement, and finally, the cleanup and completion of the job1.
* CLI and GUI Tools: While earlier versions of VPLEX required the use of the Command Line Interface (CLI) for mobility in a Metro configuration, newer versions support this functionality through the Graphical User Interface (GUI) as well2.
* Use Cases: Device mobility is often used for load balancing, tech refreshes, or other scenarios where data needs to be moved between clusters without disrupting access to the data1.
By utilizing device mobility, VPLEX Metro allows for the seamless movement of data across clusters, ensuring high availability and flexibility in data management.

NEW QUESTION # 65
......

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