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Free PDF Quiz D-VPX-DY-A-24 - Dell VPLEX Deploy Achievement–Efficient Reliable Exam Tips

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EMC Dell VPLEX Deploy Achievement Sample Questions (Q37-Q42):

NEW QUESTION # 37
A storage administrator created a local RAID-0 virtual volume. However, the administrator decided to increase data protection by requiring a distributed virtual volume.
What is the recommended method to change the local volume to a distributed volume?

A. Use VIAS to create a new distributed device, then perform a device migration
B. Place the volume in a consistency group and enable remote access
C. Use device migration to move the device to cluster-2
D. Create a device on the remote cluster without a virtual volume and attach it as a mirror

Answer: D

Explanation:
To increase data protection by converting a local RAID-0 virtual volume to a distributed virtual volume, the recommended method is to create a corresponding device on the remote cluster and then attach it as a mirror to the existing local device. This process effectively creates a distributed virtual volume that spans across both clusters.
* Create a Device on the Remote Cluster: Start by creating a new device on the remote VPLEX cluster.
This device should be of the same size as the local RAID-0 virtual volume and should not have a virtual volume associated with it1.
* Attach as a Mirror: Once the remote device is created, attach it as a mirror to the local RAID-0 virtual volume. This operation is performed using the VPLEX CLI and will begin the process of mirroring the data from the local device to the remote device1.
* Synchronization: After attaching the remote device as a mirror, the VPLEX system will synchronize the data between the local and remote devices. This ensures that both devices have identical data and are in a consistent state1.
* Distributed Virtual Volume: Once the synchronization is complete, the local and remote devices together form a distributed virtual volume. This volume now has increased data protection because it is distributed across two different clusters1.
* Verification: Verify that the distributed virtual volume is functioning correctly by checking its status and ensuring that it is accessible from both clusters1.
* Best Practices: It is important to follow the best practices for creating and managing distributed virtual volumes as outlined in the Dell VPLEX Deploy Achievement documents. This includes proper planning, execution, and verification of the mirroring process1.
In summary, the recommended method to change a local RAID-0 virtual volume to a distributed virtual volume is to create a corresponding device on the remote cluster and attach it as a mirror, thereby forming a distributed virtual volume with increased data protection.

NEW QUESTION # 38
What condition would prevent volume expansion?

A. Rebuild currently occurring on the volume
B. Metadata volume being backed up
C. Volume not belonging to a consistency group
D. Logging volume in re-synchronization state

Answer: A

Explanation:
In the context of Dell VPLEX, a rebuild occurring on a volume is a condition that would prevent the expansion of that volume. This is because the system needs to ensure data integrity and consistency during the rebuild process before any changes to the volume size can be made.
* Rebuild Process: A rebuild is a process where VPLEX re-synchronizes the data across the storage volumes, typically after a disk replacement or a failure1.
* Volume Expansion: Expanding a volume involves increasing its size to accommodate more data. This process requires that the volume is in a stable state without any ongoing rebuild operations1.
* Data Integrity: During a rebuild, the system is focused on restoring the correct data across the storage volumes. Attempting to expand a volume during this process could lead to data corruption or loss1.
* System Restrictions: VPLEX systems have built-in mechanisms to prevent administrators from performing actions that could jeopardize the system's stability or data integrity, such as expanding a volume during a rebuild1.
* Post-Rebuild Expansion: Once the rebuild process is complete and the volume is fully synchronized, the administrator can then proceed with the volume expansion1.
In summary, a rebuild currently occurring on a volume is a condition that would prevent the expansion of that volume in a Dell VPLEX system. The system must first ensure that the rebuild process is completed successfully before allowing any changes to the volume's size.

NEW QUESTION # 39
Which consistency group configuration option must be set to ensure that a consistency group will continue synchronization without manual intervention once the link is restored after a link outage?

A. rule-set-name = cluster-1-detaches
B. auto-resume = true
C. rebuild-type = full
D. rebuild-allowed = true

Answer: B

Explanation:
To ensure that a consistency group will continue synchronization without manual intervention once the link is restored after a link outage, the configuration option that must be set is auto-resume = true.
* Consistency Group Configuration: A consistency group in Dell VPLEX is a collection of virtual volumes that are managed together to maintain write-order fidelity. This is crucial for applications that require all writes across multiple volumes to be consistent with each other1.
* Link Outage Handling: In the event of a link outage, it is important for the consistency group to be able to automatically resume synchronization once the link is restored. This minimizes the manual intervention required and ensures data integrity is maintained1.
* Auto-resume Option: The auto-resume = true setting is used to configure the consistency group to automatically resume synchronization. This setting is part of the consistency group's attributes and can be configured via the VPLEX CLI or Unisphere for VPLEX1.
* Implementation: To set this option, the administrator would use the VPLEX CLI to navigate to the consistency group settings and modify the auto-resume attribute to true. This ensures that the consistency group will automatically attempt to resume synchronization after a link outage is resolved1.
* Best Practices: It is recommended to enable auto-resume for all consistency groups that require high availability and automatic recovery from link outages. This setting is part of the best practices for VPLEX consistency groups as outlined in the Dell VPLEX Deploy Achievement documents1.
In summary, the auto-resume = true configuration option is essential for ensuring that a VPLEX consistency group will continue synchronization without manual intervention after a link outage, thereby maintaining the high availability and data protection standards set by Dell VPLEX Deploy Achievement guidelines.

NEW QUESTION # 40
A RAID-C device has been built from a 100 GB extent and a 30 GB extent. How can this device be expanded?

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

Answer: D

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 # 41
What is the maximum number of synchronous consistency groups supported by VPLEX?

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

Answer: B

Explanation:
The maximum number of synchronous consistency groups supported by VPLEX is 256. This number is determined by the system's capabilities and is designed to ensure optimal performance and manageability.
* Consistency Groups: Consistency groups in VPLEX are used to group multiple virtual volumes together to ensure write-order fidelity, which is crucial for applications requiring transactional integrity12.
* Synchronous Operations: Synchronous consistency groups are particularly important for environments where data must be kept consistent across geographically dispersed clusters in real-time12.
* System Limitations: The limit of 256 synchronous consistency groups is set to balance the system's performance with the need for data consistency. It ensures that the system can maintain the required performance levels while providing the data protection and availability features12.
* Configuration and Management: Administrators must carefully plan and manage the consistency groups within the limits of the system to ensure that all critical data is protected and that the system operates efficiently12.
* Documentation Reference: For detailed information on configuring and managing consistency groups, administrators should refer to the Dell VPLEX Deploy Achievement documents and best practice guides12.
In summary, the verified answer to the maximum number of synchronous consistency groups supported by VPLEX is 256. This limitation is part of the system design to ensure high availability and performance.

NEW QUESTION # 42
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