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NEW QUESTION # 49
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?
Answer: B
NEW QUESTION # 50
What is the correct order of steps to create a virtual volume?
Answer:
Explanation:
Explanation:
The correct order of steps to create a virtual volume is:
* Claim storage volume
* Create extent
* Create device
* Create virtual volume
* Claim Storage Volume: The first step involves claiming a storage volume from the underlying storage array. This is where you identify and allocate the physical storage that will be used.
* Create Extent: Once the storage volume is claimed, the next step is to create an extent. An extent is a specific range of block addresses within a storage volume.
* Create Device: After creating an extent, you then create a device. A device in VPLEX terminology is a logical representation of storage that can be used by hosts.
* Create Virtual Volume: The final step is to create a virtual volume from the device. A virtual volume is what is presented to hosts; it's the logical unit that they will access for storage.
This process ensures that storage is properly allocated and managed within the VPLEX environment, allowing for flexibility and efficiency in storage utilization.
For detailed procedures and best practices, it's recommended to consult the official Dell VPLEX documentation and training materials, which provide in-depth guidance on managing and configuring VPLEX systems.
NEW QUESTION # 51
A storage administrator has created a VPLEX distributed device. The administrator is performing application tests on the host utilizing the distributed virtual volumes. During testing, some of the write response times appear to be elongated.
What is a characteristic of distributed devices that explains this issue?
Answer: A
Explanation:
When a VPLEX distributed device experiences elongated write response times, it is typically due to the characteristic of VPLEX that requires writes to be committed to backend storage on both clusters before an acknowledgement is sent to the host. This ensures data integrity and consistency across the distributed device but can lead to increased response times, especially if there is network congestion or latency issues between the clusters.
Here's a detailed explanation:
* Write I/O Commitment:For a VPLEX distributed device, any write I/O must be committed to backend (BE) storage on both the local and remote clusters1.
* Network Impact:If the inter-cluster communication network (FC/IP WAN) is experiencing congestion or high latency, it will increase the round-trip time of I/O packets, leading to performance issues and elongated write response times1.
* Performance Best Practices:VPLEX best practices suggest that the round-trip time (RTT) between clusters should not exceed 5 ms to maintain optimal performance, with an RTT of 1 ms recommended for campus-wide networks1.
* Troubleshooting Steps:To address such issues, administrators should check for network congestion indicators in the firmware logs and ensure that all WAN communication ports are operational and that SFPs have sufficient power1.
* Resolution:If the VPLEX is configured for FC metro and supported by Dell EMC, collecting switch logs and engaging Dell EMC support is advised.For IP metro configurations, validating the health of the IP network is crucial to identify the cause of congestion1.
By understanding this characteristic of VPLEX distributed devices, storage administrators can take appropriate measures to mitigate elongated write response times and maintain system performance.
NEW QUESTION # 52
What is the maximum number of virtual volumes that can be placed into a single consistency group?
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 # 53
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?
Answer: B
NEW QUESTION # 54
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