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EMC Dell VPLEX Operate Achievement Sample Questions (Q42-Q47):

NEW QUESTION # 42
What is the relationship between a storage volume and an extent?

A. A storage volume can be created out of multiple extents
B. A storage volume can be split into multiple extents
C. An extent must map to an entire storage volume
D. An extent can span multiple storage volumes

Answer: B

Explanation:
In VPLEX, a storage volume is a logical representation of physical storage, and it can be divided into multiple extents.An extent is a contiguous range of block addresses within a storage volume that VPLEX manages as a single unit1.
* Storage Volume: This is the physical storage presented to VPLEX from the backend storage arrays.It represents the total capacity available for use in VPLEX1.
* Extent: An extent is a subset of a storage volume.It is a logical division within a storage volume that VPLEX uses to create virtual volumes1.
* Division into Extents: A storage volume can be split into multiple extents, allowing for more granular management of storage resources.This is useful for creating multiple virtual volumes from a single storage volume1.
* Virtual Volume Creation: Extents are used by VPLEX to create virtual volumes.By splitting a storage volume into extents, VPLEX can combine extents from different storage volumes to create a virtual volume1.
* Management Flexibility: The ability to split a storage volume into multiple extents provides flexibility in storage management, enabling VPLEX to optimize storage utilization and performance1.
By splitting a storage volume into multiple extents, VPLEX can efficiently manage and allocate storage resources, creating virtual volumes that meet the specific needs of applications and workloads.

NEW QUESTION # 43

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: C

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 # 44
How many copies can RecoverPoint maintain in a MetroPoint topology?

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

Answer: A

NEW QUESTION # 45
In a VPLEX Metro, what factor has a direct impact on VPLEX performance with respect to WAN bandwidth?

A. Read rate on distributed volumes
B. Raid rebuild on array
C. Thin pool rebalances
D. Write rate on distributed volumes

Answer: D

Explanation:
In a VPLEX Metro environment, the write rate on distributed volumes has a direct impact on VPLEX performance with respect to WAN bandwidth. Here's how:
* Distributed Volumes: Distributed volumes in VPLEX Metro span across two geographically separated clusters and are designed to provide continuous availability and data mobility1.
* Write Operations: Write operations on distributed volumes require data to be written to both clusters before an acknowledgment is sent back to the host.This ensures data consistency across both sites2.
* WAN Bandwidth: The Wide Area Network (WAN) bandwidth between the two clusters is a critical factor in the performance of these write operations.If the WAN bandwidth is insufficient, it can lead to increased latency and reduced throughput3.
* Performance Impact: With only half the available WAN-COM paths, VPLEX can exceed bandwidth limitations on the existing WAN-COM paths, causing severe latency impacting the remote writes of distributed devices3.
* Best Practices: VPLEX best practices indicate that the round-trip time (RTT) between VPLEX clusters shouldn't exceed 5 ms to provide the best performance, and an RTT of 1 ms is recommended for a campus-wide network2.
By managing the write rate on distributed volumes and ensuring adequate WAN bandwidth, VPLEX Metro can maintain high performance and meet the required service levels for data availability and accessibility.

NEW QUESTION # 46
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 # 47
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