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EMC Dell VPLEX Operate Achievement Sample Questions (Q24-Q29):

NEW QUESTION # 24
LUNs are being provisioned from an ALUA-capable back-end array to VPLEX. What is the path requirement for each VPLEX director when connecting to this type of array?

A. At least two paths to every back-end array and storage volume
B. At least two paths to the active array controller only
C. At least two paths to both the active and passive array controllers
D. At least two paths to both the active and non-preferred array controllers

Answer: D

Explanation:
When provisioning LUNs from an ALUA-capable back-end array to VPLEX, it is required that each VPLEX director has at least two paths to both the active and non-preferred array controllers. This ensures redundancy and continuous availability of data even if one path or controller fails.
* ALUA-Capable Arrays: ALUA (Asymmetric Logical Unit Access) arrays present active and non-preferred (or passive) paths to the storage.The active paths are used for I/O under normal operations, while non-preferred paths are available for use if the active paths fail1.
* Path Requirements: For each VPLEX director, there should be at least two paths to the active controller and at least two paths to the non-preferred controller.This configuration provides redundancy and supports the ALUA functionality1.
* VPLEX Director Connectivity: VPLEX directors manage the paths to the storage arrays.Having multiple paths from each director ensures that VPLEX can continue to provide access to the LUNs even if there are issues with one of the paths or controllers1.
* Redundancy and Availability: The path requirement is crucial for maintaining high availability and redundancy, which are key benefits of using VPLEX in conjunction with ALUA-capable arrays1.
* Best Practices: Following this best practice for path connectivity aligns with VPLEX's goal of providing continuous data availability and seamless failover capabilities in the event of hardware failures or maintenance activities1.
By adhering to the path requirement of having at least two paths to both the active and non-preferred array controllers, VPLEX can leverage the ALUA functionality of the back-end array to ensure optimal performance and data availability.

NEW QUESTION # 25
Which VPLEX model is recommended for VPLEX for All Flash (VAF)?

A. VS2 and VS6
B. VS6 only
C. VS2 only
D. VS1

Answer: A

Explanation:
For VPLEX for All Flash (VAF), both the VS2 and VS6 models are recommended. Here's why:
* VS2 Model: The VS2 model is a previous generation of VPLEX hardware that supports all-flash configurations.It is designed to handle the high throughput and low latency requirements of all-flash storage1.
* VS6 Model: The VS6 is the latest generation of VPLEX hardware, offering enhanced performance and scalability compared to the VS2.It is also suitable for all-flash environments and is designed to leverage the full capabilities of flash storage1.
* Upgrade Path: Organizations with existing VS2 hardware can continue to use it for VAF, but they may consider upgrading to VS6 for improved performance and newer features.The VPLEX architecture allows for non-disruptive upgrades from VS2 to VS6, making it a future-proof solution1.
* VPLEX Technology: Both VS2 and VS6 utilize VPLEX technology that virtualizes storage across multiple arrays, allowing for seamless data mobility and continuous availability.This technology is particularly beneficial in all-flash environments where performance and uptime are critical1.
* Documentation: The Dell VPLEX Operate Achievement documents provide detailed information on the capabilities of both VS2 and VS6 models, including their suitability for VAF environments1.
By choosing either VS2 or VS6 models for VPLEX for All Flash, organizations can ensure they have a robust and high-performing storage virtualization platform that meets the demands of modern all-flash arrays.

NEW QUESTION # 26
Which method of virtual volume expansion requires the volume to be expanded on the array first?

A. Extent expansion
B. RAID-C expansion
C. Storage volume
D. Concatenation

Answer: C

Explanation:
The method of virtual volume expansion that requires the volume to be expanded on the array first is the storage volume expansion methD.This method involves increasing the size of the physical storage volume on the array before expanding the virtual volume in VPLEX.
* Array Expansion: The first step is to expand the physical storage volume on the array.This is typically done through the array's management interface and involves adding more storage or extending the existing volume1.
* VPLEX Recognition: Once the storage volume is expanded on the array, VPLEX must recognize the new size of the volume.This may require a rescan or refresh within the VPLEX management interface1.
* Virtual Volume Expansion: After VPLEX recognizes the new size of the storage volume, the virtual volume can then be expanded to utilize the additional space.This is done within the VPLEX management interface, where the virtual volume is configured to include the additional capacity1.
* Storage Volume Method: The storage volume expansion method is distinct from other methods like concatenation, extent expansion, or RAID-C expansion, which involve different approaches to increasing virtual volume size within VPLEX itself1.
By expanding the storage volume on the array first, administrators can ensure that the additional capacity is available for use by VPLEX, allowing for the seamless expansion of virtual volumes to accommodate growing data needs.

NEW QUESTION # 27
What is a VPLEX RAID-0 device?

A. Extent that stripes data beneath a top-level device
B. Extent that concatenates data on a top-level device
C. Device that stripes data beneath a top-level device
D. Device that concatenates data on a top-level device

Answer: C

Explanation:
A VPLEX RAID-0 device is a configuration where data is striped across multiple storage volumes to improve performance. Here's a detailed explanation:
* RAID-0 Definition: RAID-0 is a disk array configuration that involves striping data across multiple disks without redundancy.This increases performance because I/O operations can be performed concurrently on all disks1.
* Device Stripes Data: In the context of VPLEX, a device refers to a logical unit that is created from physical storage volumes.When a VPLEX device is configured as RAID-0, it stripes data across the underlying storage volumes1.
* Top-Level Device: The term 'top-level device' refers to the logical device that is presented to hosts and applications.In VPLEX, this top-level device is the virtual volume that is created from one or more RAID-configured devices1.
* Striping Beneath Top-Level Device: The striping occurs beneath the top-level device, meaning that it is handled within the VPLEX system and is transparent to the host.The host sees a single logical unit, while the VPLEX system manages the distribution of data across the physical volumes1.
* Performance Considerations: RAID-0 devices provide better performance since data is retrieved from several storage volumes at the same time. However, RAID-0 devices do not include a mirror to provide data redundancy.They are used for non-critical data that requires high speed and low cost of implementation1.
By configuring a VPLEX device as RAID-0, administrators can leverage the performance benefits of striping for applications that require high throughput and do not need the redundancy provided by other RAID levels.

NEW QUESTION # 28
What determines which cluster will service I/O in the event of a WAN COM failure for a distributed device that is not a member of a consistency group?

A. Rule set of the distributed device
B. Detach rule of the storage view
C. Detach rule of the consistency group
D. VPLEX Witness

Answer: A

NEW QUESTION # 29
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