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5V0-21.21 Exam Questions & Answers

VMware HCI Master Specialist  •  VMware

66 Questions Updated Sep 2026 99% Pass Rate
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Sample 5V0-21.21 Questions

Practice with real exam-style questions, each with the verified correct answer and explanation.

Q1 MultipleChoice

A cache disk failure marked a vSAN disk group as failed, and the data is being rebuilt on other disk groups.

Which action should the vSAN administrator take to reduce the negative impact on the VMs?

Correct Answer: A
Explanation:

https://docs.vmware.com/es/VMware-vSphere/6.5/com.vmware.vsphere.virtualsan.doc/GUID-8D81FCF6-AC9A-4C2C-A8AC-DE50B9965054.html

Q2 MultipleChoice

An administrator has an absent capacity disk.

Which action, if any, should the administrator take to resolve the problem?

Correct Answer: B
Explanation:

The best action to take to resolve the problem is to replace the faulty disk, as stated in the VMware official guide: 'Hosts can include a maximum of five disk groups [1], each of which must have one flash cache device and one or more capacity devices [1]. In vSAN, each host can have a maximum of seven capacity devices, excluding the flash cache device [1]. The flash cache device is used to accelerate read and write operations [1], while the capacity devices provide the raw storage capacity for the vSAN cluster.'

https://docs.vmware.com/en/VMware-vSphere/7.0/com.vmware.vsphere.vsan-monitoring.doc/GUID-4E3390C1-6C50-49E5-AEB6-C9BC037979A1.html

Q3 MultipleChoice

Which statement accurately describes the result when proper VM Storage Policy Affinity Rules on a stretched vSAN cluster are set?

Correct Answer: B
Explanation:

Setting proper VM/Host Group Rules and VM Storage Policy Affinity Rules are beneficial for several reasons Bandwidth is not unnecessarily sent across the inter-site link Lower inter-site bandwidth utilization In the situation where the alternate site is disconnected, the VM will continue to have access to its vmdk. from https://core.vmware.com/resource/vsan-stretched-cluster-guide#sec7341-sub5

Q4 MultipleChoice

An organization has two vSAN clusters managed by the same vCenter server, each providing 100 TB of storage. The first cluster runs at 75% of its storage capacity, and the second cluster runs at 40% of its storage capacity.

The company also has the following:

* an iSCSI array of 300 TB, which runs at 76% of its capacity

* a NAS system of 200 TB, which runs at 10% of its capacity

* a Fiber channel (FC) array of 300 TB, which runs at 80% of its capacity

The administrator is asked to add an additional 25 TB of storage to the first cluster but is also made aware that there is no budget to purchase new hardware and that the vSAN Storage Policy Based Management must be kept in place.

Which storage option will work for this use case?

Correct Answer: C
Explanation:

https://blogs.vmware.com/virtualblocks/2020/09/16/introducing-vmware-vsan-hci-mesh/

Q5 MultipleChoice

An administrator would like to upgrade ten identically configured 2-node vSAN clusters from vSAN 6.7 U3 to vSAN 7.0 U1. Currently, each 2-node vSAN cluster is using a dedicated vSAN witness host appliance. As a result of the upgrade, the administrator would like to leverage the vSAN shared witness feature to reduce the resources being consumed.

In preparation for the first vSAN cluster upgrade, the administrator has completed the following tasks:

1. Upgraded vCenter Server to vCenter Server 7.0 U1.

2. vSphere High Availability (HA) has been disabled on the vSAN Cluster.

3. Upgraded the vSAN witness host appliance to vSphere 7.0 U1.

4. Upgraded both vSAN data nodes to vSphere 7.0 U1.

The key requirement is to ensure that backwards compatibility to the existing version of vSAN is maintained during the upgrade process.

Which three additional steps should the administrator complete to ensure that subsequent clusters can share the same vSAN Witness? (Choose three.)

Correct Answer: C, D, F
Explanation:

https://blogs.vmware.com/virtualblocks/2020/09/21/shared-witness-for-2-node-vsan-deployments/

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Frequently Asked Questions

The 5V0-21.21 is VMware's expert-level certification exam that validates advanced knowledge of Hyper-Converged Infrastructure (HCI) solutions, design, and implementation. It is intended for IT professionals who have extensive experience with VMware vSAN and HCI environments and want to demonstrate master-level expertise in this domain.

Candidates should hold the VMware Certified Associate - HCI (VCA-HCI) or equivalent certification and have substantial hands-on experience with vSAN and HCI solutions. VMware recommends at least 2-3 years of experience working with hyperconverged infrastructure environments before attempting this master-level exam.

The exam typically consists of 75-85 multiple-choice questions and candidates have 120 minutes to complete it. The passing score is generally around 300 out of 500 points, though VMware may adjust this threshold based on exam difficulty and performance data.

The exam covers advanced vSAN architecture, performance optimization, disaster recovery, security, capacity planning, and troubleshooting of HCI environments. It also includes knowledge of VMware Cloud Foundation, stretched clusters, storage policies, and real-world HCI implementation scenarios.

Candidates should study official VMware documentation, take online training courses, use practice exams, and engage in hands-on lab work with vSAN environments. Joining VMware communities, reading whitepapers, and gaining practical experience with HCI deployments are also valuable preparation methods for this advanced certification.
Exam Details
  • Exam Code5V0-21.21
  • VendorVMware
  • Total Questions66
  • LanguageEnglish
  • Last UpdatedSep 4, 2026
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