5V0-21.20: VMware HCI Master Specialist - Free download from ExamHUB

Reference the exhibit.

A university campus has a site topology illustrated in the exhibit. Adjacent connected buildings are connected with a single 40gb layer 3 network with a RTT of 0.6ms as depicted by each line. An architect wants to configure a fault domain in each building.

What would the architect need change in order to implement a fully supported vSAN Cluster?

Enable a single Layer 2 network across all buildings for vSAN connectivity.
Decrease the existing RTT between the existing links by 0.1ms or more.
Add an additional link to the existing adjacent links to make it redundant.
Enable IPv6 networks across all buildings for vSAN connectivity.

Correct answer: C

When designing a vSAN Cluster, which three should be considered when sizing a vSAN datastore? (Choose three.)

Storage Policy or Policies to be used
capacity device queue depth
vSAN Slack Space
cache disks with 10% of the Disk Group
On-Disk Format overheard
endurance level of capacity disk used

Correct answer: ABC

Explanation:

Reference: https://core.vmware.com/resource/vmware-vsan-design-guide

Which must be configured by a Kubernetes user allow for dynamic provisioning of container volumes in vSAN using storage policies?

ReplicaSet
Pod
StorageClass
ReplicationController

Correct answer: C

Explanation:

Reference: https://vmware.github.io/vsphere-storage-for-kubernetes/documentation/policy-based-mgmt.html

An All-Flash vSAN cluster has 4 nodes with this disk group composition on each host:

1 × 800 GB SAS SSD
6 × 3.84 TB SATA SSD

An administrator observes that in an All-Flash cluster, the Write Buffer Free Percentage is consistently low. As a result, there is increased latency experienced by the workloads.

Which remediation steps will resolve this issue?

Add a second disk group with a new cache device and distribute the capacity disks equally.
Add a second cache device to the same disk group to increase the caching size.
Modify advanced vSAN configuration parameters to utilize the complete 800 GB for caching.
Replace the existing cache device with a larger cache device.

Correct answer: C

An administrator receives an alert for vCenter being unavailable. With vCenter running on vSAN, the administrator wants to know if any other VMs are impacted.

What command can an administrator run to determine the overall health of the vSAN objects?

esxcli vsan storage list
esxcli vsan cmmds timemachine get
esxcli vsan cluster get
esxcli vsan health cluster list

Correct answer: C

Explanation:

Reference: https://www.vmware.com/content/dam/digitalmarketing/vmware/en/pdf/products/vsan/vmware-virtual-san-health-check-guide-6.1.pdf (66)

A failed storage controller has two vSAN disk groups attached. The components contained on the drives in those disk groups are marked Degraded. vSAN reports that some objects do not comply with their assigned storage policy.

How is the compliance issue resolved?

Initiate a proactive rebalance to force component repairs.
Degraded components are repaired after CLOM Repair Delay Timer expires.
Rebuilding of the degraded components starts immediately.
Storage policies must be reapplied to all affected objects.

Correct answer: C

During planned maintenance of a four-node vSAN cluster, an outsourced IT contractor accidentally removed a 2.5" SSD cache disk from one of the vSAN nodes. The storage policy has been configured with FTT=1 RAID 1, and the disk management UI marked the disk group as absent.

Which remediation steps should the administrator select to ensure VMs become compliant with the storage policy as soon as possible?

replace the SSD cache disk > rescan > add disk back in disk group
enter host in maintenance > remove from disk group > shutdown host > replace disk > power on host
remove disk group > enter host in maintenance > fully evacuate all data > exit maintenance
vSAN Health Check > retest > object health > repair objects immediately

Correct answer: A

A 3-node All-Flash vSAN cluster has this configuration:

One disk group per host
All disk groups have identical make & model disks of an 800GB NVMe SSD cache and 2x 4TB SAS SSDs each

An administrator has been tasked with expanding storage capacity by adding one additional disk group with this configuration:

1.6TB SAS SSD cache and 1x 4TB SAS SSDs

Assuming all the disks are compliant with the vSAN HCL, which is true?

The additional disk group would not be possible as vSAN would not allow it.
The additional disk group would work and be fully supported by VMware support.
The additional disk group will generate an 'Advanced vSAN Configuration in sync' health check warning.
The additional disk group would make this cluster an unsupported configuration.

Correct answer: D

Explanation:

Reference: https://blogs.vmware.com/virtualblocks/2019/04/18/vsan-disk-groups/

Which two statements are true about enabling deduplication and compression on an All-Flash vSAN cluster with data? (Choose two.)

On-disk format version 3.0 or later is required to support deduplication and compression.
This can be enabled through storage policies and does not require any data migration.
Deduplication and Compression cannot be enabled on an existing vSAN datastore with data.
Move one host at a time to maintenance mode and enable deduplication and compression.
This requires data evacuation and disk format upgrade of all the disk groups.

Correct answer: AE

Explanation:

Reference: https://docs.vmware.com/en/VMware-vSphere/6.7/com.vmware.vsphere.virtualsan.doc/GUID-BD30E413-F870-4C25-9507-123F59D0A4B8.html

Which two statements regarding networking are true for a vSAN Stretched Cluster? (Choose two.)

A 5ms RTT or less is required between the data sites.
The vSAN data network must communicate with the vSAN witness host.
PIM is required for stretched vSAN clusters.
A Stretched Cluster can use Layer 2 or Layer 3 communication for the vSAN network.
A Stretched Layer 2 network is required at the vSAN data sites and at the witness site.

Correct answer: AD

Explanation:

Reference: https://core.vmware.com/resource/vsan-stretched-cluster-guide

Vendor:	VMware
Exam Code:	5V0-21.20
Exam Name:	VMware HCI Master Specialist
Date:	Jan 25, 2021
File Size:	566 KB

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