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EMC Dell VPLEX Operate Achievement Sample Questions (Q34-Q39):

NEW QUESTION # 34
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 the active array controller only
B. At least two paths to every back-end array and storage volume
C. At least two paths to both the active and non-preferred array controllers
D. At least two paths to both the active and passive array controllers

Answer: C

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 # 35
What is a feature of GeoSynchrony 6.0 with respect to service account login to the VPlexcli?

A. Service account requires no authentication to the Linux shellVPlexcli requires certificate authority
B. Service account requires authentication only to the Linux shellVPlexcli does not require an extra authentication step
C. Service account requires authentication to the Linux shellVPlexcli requires authentication through LDAP
D. Service account requires authentication to the Linux shellVPlexcli requires an RSA token

Answer: D

Explanation:
In GeoSynchrony 6.0, a feature concerning service account login to the VPlexcli is that the service account requires authentication to the Linux shell, and VPlexcli requires an RSA token. This two-factor authentication process enhances security by requiring both a password and a physical token.
* Linux Shell Authentication: The service account must first authenticate to the Linux shell, which is the underlying operating system for VPLEX.This typically involves entering a username and password1.
* VPlexcli Authentication: After gaining access to the Linux shell, the service account must then authenticate to the VPlexcli, which is the command-line interface for managing VPLEX.For this step, an RSA token is required, providing a second layer of security1.
* RSA Token: An RSA token is a form of two-factor authentication that generates a time-sensitive, one-time-use code.This code must be provided in addition to the password to gain access to VPlexcli1.
* Security Enhancement: The requirement for both shell authentication and an RSA token for VPlexcli access helps to prevent unauthorized access and ensures that only authenticated users can perform administrative tasks on the VPLEX system1.
* Best Practices: This authentication process aligns with best practices for securing critical infrastructure, such as storage systems, by implementing multi-factor authentication to protect against potential security breaches1.
By requiring authentication to the Linux shell and an RSA token for VPlexcli, GeoSynchrony 6.0 ensures a secure environment for managing VPLEX systems.

NEW QUESTION # 36
LUNs belonging to an ESXi cluster were encapsulated behind VPLEX. What information must be shared with the ESXi administrator so that they can re-discover the datastore and the RDM LUNs?

A. VML ID
B. Virtual volume VPD
C. UUID of back-end LUN
D. WWN:WWPN

Answer: B

Explanation:
When LUNs belonging to an ESXi cluster are encapsulated behind VPLEX, the information that must be shared with the ESXi administrator for them to re-discover the datastore and the RDM LUNs is the Virtual Volume VPD (Vital Product Data).
* Virtual Volume VPD: The VPD for a virtual volume contains essential information about the volume, such as its identifier, which is used by the ESXi host to recognize and differentiate the volume1.
* Re-Discovery Process: After encapsulation, the ESXi administrator will need to perform a rescan of the storage adapters on the ESXi hosts.During this rescan, the hosts use the VPD information to identify the newly encapsulated LUNs and re-discover the associated datastore and RDM LUNs1.
* Datastore and RDM LUNs: Datastores are storage containers that hold virtual machine files, while RDM (Raw Device Mapping) LUNs allow a virtual machine to directly access a storage device.Both rely on unique identifiers to ensure correct access and operation within the ESXi environment1.
* Sharing Information: The VPLEX administrator should provide the VPD information to the ESXi administrator, typically after the encapsulation process is complete and before the ESXi storage rescan is initiated1.
* Ensuring Access: By sharing the correct VPD information, the ESXi administrator can ensure that the ESXi cluster correctly identifies and regains access to the encapsulated LUNs, maintaining the continuity of services and data availability1.
The sharing of the Virtual Volume VPD is a critical step in the process of LUN encapsulation behind VPLEX, ensuring that the ESXi cluster can successfully re-discover and utilize the datastore and RDM LUNs.

NEW QUESTION # 37
What happens to global cache size if a director fails and is removed from the cluster?

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

Answer: A

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 # 38
Which VPLEX model is recommended for VPLEX for All Flash (VAF)?

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

Answer: B

NEW QUESTION # 39
......

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EMC Dell VPLEX Operate Achievement Sample Questions (Q34-Q39):

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