VCP-DCV Configure and Manage vSphere Storage Practice Test 1 — 15 Questions

Question 1

An administrator notices that a VM with a 500 GB virtual disk stored on an NFS datastore is performing poorly during backup operations. The NFS datastore is mounted with default settings. Which change will most likely improve performance?

Choose an answer to begin — your selection is scored in the full session.

Accepted Answer

Configure the NFS datastore to use vStorage APIs for Array Integration (VAAI).. VAAI for NFS offloads storage operations like hardware-assisted locking and full-file/clone operations to the NAS array, reducing CPU overhead on the ESXi host and improving performance during backup-intensive tasks. Since the NFS datastore is mounted with default settings, VAAI is not automatically enabled and must be explicitly configured to leverage array-based primitives.

Answer

Move the VM to a cluster with more memory.

Answer

Enable jumbo frames on the ESXi host's VMkernel adapter for NFS.

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Increase the size of the NFS datastore to 1 TB.

Question 2

A vSphere administrator is troubleshooting a VM that has been disconnected from its virtual disk. The VM's virtual disk file (vmdk) is still present on the datastore, but the VM cannot be powered on. Which step should the administrator take first to resolve the issue?

Accepted Answer

Use the vmkfstools command to re-register the virtual disk.. When a VM is disconnected from its virtual disk but the .vmdk file remains on the datastore, the issue is often a corrupt or missing disk descriptor file. The vmkfstools command with the -fix option can repair the descriptor file, re-establishing the connection between the VM and its virtual disk without requiring VM recreation or manual re-attachment.

Answer

Create a new VM and attach the existing vmdk file.

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Re-add the virtual disk from the datastore browser to the VM.

Answer

Perform a storage vMotion of the VM to another datastore.

Question 3

A vSphere administrator is planning to configure VMware vSAN. Which TWO requirements must be met for a vSAN cluster?

Accepted Answer

Each host must have at least one SSD and one HDD for capacity.. VSAN requires at least one SSD (or NVMe) for the cache tier and one HDD (or SSD) for the capacity tier on each host to form a disk group. This hybrid or all-flash configuration is fundamental to vSAN's storage architecture, where the cache tier accelerates writes and reads, while the capacity tier provides persistent storage.

Answer

A dedicated 10 GbE network for vSAN traffic.

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All hosts must have identical CPU models.

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A shared storage array accessible by all hosts.

Question 4

An administrator is configuring Storage DRS on a datastore cluster. Which THREE conditions must be met for Storage DRS to migrate virtual disks?

Accepted Answer

The source and destination datastores must be part of the same datastore cluster.. Storage DRS operates within a single datastore cluster, which is a collection of datastores that share resources and are managed as a single entity. For Storage DRS to migrate virtual disks via Storage vMotion, both the source and destination datastores must be members of the same datastore cluster; cross-cluster migrations are not supported by Storage DRS.

Answer

The virtual disk must not be attached to a snapshot.

Answer

The storage array must support VAAI.

Question 5

An administrator needs to expand a VMFS6 datastore that is currently 2 TB in size. The LUN presented to the ESXi host has been expanded to 3 TB from the storage array. Which command should the administrator use to extend the datastore?

Accepted Answer

vmkfstools --growfs /vmfs/devices/disks/naa.60050768018603e1b800000000000001. The correct command is `vmkfstools --growfs` because it is the only VMware-supported method to expand a VMFS6 datastore after the underlying LUN has been resized. This command grows the file system to use the newly available unpartitioned space on the device, without requiring a new partition. The `--growfs` option specifically targets the VMFS file system, not the partition, which is essential for VMFS6 datastores.

Answer

esxcli storage vmfs extend -l naa.60050768018603e1b800000000000001

Answer

esxcli storage vmfs grow -l naa.60050768018603e1b800000000000001

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vmkfstools --extend /vmfs/devices/disks/naa.60050768018603e1b800000000000001

Question 6

An administrator runs vmkfstools on a VMFS datastore and receives the output shown. The datastore is backed by a single LUN from a SAN array. What is the most likely explanation for the multiple extents shown?

Accepted Answer

The datastore was expanded by adding an extent from the same LUN.. When a VMFS datastore is expanded using the same LUN, vmkfstools can show multiple extents because the additional space is added as a separate extent on the same physical LUN. This is a common practice to grow a datastore without reprovisioning a new LUN, and the output reflects the original and expanded extents both pointing to the same LUN identifier.

Answer

The LUN was presented to the host with multiple paths, and each path is treated as a separate extent.

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The datastore is a VMFS6 datastore with three logical volumes aggregated into one namespace.

Answer

The virtual machine has a large VMDK file that spans multiple extents due to VMFS6 sub-block allocation.

Question 7

Which THREE actions can be performed on a VMFS datastore without unmounting it or putting the ESXi host into maintenance mode?

Accepted Answer

Remove the datastore from the host's inventory.. Removing a datastore from the host's inventory simply detaches the datastore object from the ESXi host's configuration without affecting the underlying LUN or requiring the host to enter maintenance mode. This operation only modifies the host's metadata, not the storage device itself, so it can be performed while VMs are running on other datastores.

Answer

Upgrade the datastore from VMFS5 to VMFS6.

Answer

Add a new extent to the datastore from a different LUN.

Question 8

Match each VMware acronym to its full name.

Accepted Answer

ESXi: VMware ESXi is a bare-metal hypervisor.. Common VMware acronyms and their expansions.

Answer

ESXi: VMware vCenter Server is a centralized management platform.

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vSphere: VMware VMFS is a clustered file system.

Question 9

Match each vSphere object to its maximum supported size (vSphere 7).

Accepted Answer

Virtual machine - max vCPUs per VM: 256. Correct matches: VM max vCPUs 256, VM max memory 6 TB, datastore max size 64 TB, cluster max hosts 64. Common confusions include lower values from previous versions.

Answer

Virtual machine - max vCPUs per VM: 128

Answer

Datastore - max size: 32 TB

Question 10

A vSphere administrator has a VMFS6 datastore that is running low on space. The storage array has additional unallocated LUNs. The administrator attaches a new 2 TB LUN to the ESXi host. What is the correct procedure to increase the datastore capacity?

Accepted Answer

Use the 'Increase datastore capacity' wizard to add the LUN as an extent. The correct procedure is to use the 'Increase datastore capacity' wizard to add the new LUN as an extent to the existing VMFS6 datastore. VMFS6 supports online extension, allowing the datastore to be expanded without unmounting or disrupting running VMs. Option B is incorrect because unmounting and extending the partition is unnecessary; VMFS6 handles this dynamically. Option C is incorrect because recreating the datastore with a larger block size is disruptive and not required—adding an extent achieves the capacity increase. Option D is incorrect because creating a new datastore and migrating VMs is unnecessary and adds complexity; the existing datastore can be extended seamlessly.

Answer

Unmount the datastore, expand the VMFS partition, then remount

Answer

Recreate the datastore with a larger block size and restore from backup

Answer

Create a new datastore on the LUN and use Storage vMotion to migrate VMs

Question 11

An administrator has configured Storage DRS on a cluster of datastores. The cluster includes both NFS and VMFS datastores. The administrator notices that Storage DRS recommendations are not being generated for some datastores. What is the most likely cause?

Accepted Answer

NFS datastores are not supported by Storage DRS. Storage DRS does not support NFS datastores unless they are on a NAS array that supports VAAI for storage offload operations. In this scenario, the cluster includes both NFS and VMFS datastores, but Storage DRS recommendations are not generated for some datastores. The most likely cause is that those datastores are NFS and do not meet the requirements for Storage DRS. Option B (space utilization below threshold) is incorrect because Storage DRS would still generate recommendations when space utilization is below the threshold, just perhaps less frequently. Option C (datastores part of a vSAN cluster) is incorrect because vSAN uses its own distributed resource scheduler, not Storage DRS, and would not be included in the cluster. Option D (I/O metrics not enabled) is incorrect because if I/O metrics were not enabled, recommendations based on I/O latency would not be generated, but recommendations based on space utilization would still be generated; however, the question states recommendations are not being generated for some datastores, which points to the NFS incompatibility.

Answer

The datastore space utilization is below the threshold

Answer

The datastores are part of a vSAN cluster

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I/O metrics are not enabled for the Storage DRS cluster

Question 12

A company is implementing VMware vVols with a VASA provider from a major storage vendor. The environment includes multiple ESXi hosts and a vCenter Server. After binding a virtual machine to a vVol, the administrator notices that the VM cannot power on. The storage status shows 'Not mounted'. What is the most likely cause?

Accepted Answer

The VASA provider is not registered on the ESXi host where the VM is being powered on. vVols require storage container binding per host. If the VASA provider is not properly registered on that host, the vVol cannot be mounted. Option A is correct. Option B (vCenter Server not connected) does not prevent direct mount if the host has the provider. Option C (protocol endpoint not reachable) would affect all VMs. Option D (storage policy) would affect placement, not power-on.

Answer

The vCenter Server is not connected to the VASA provider

Answer

The protocol endpoint is not reachable from the ESXi host

Answer

The storage policy does not include the correct capability

Question 13

An administrator is troubleshooting performance issues on a VMFS datastore hosting SQL Server VMs. Storage I/O Control (SIOC) is enabled, but the administrator notices that congestion is detected but no throttling is applied. What could be the reason?

Accepted Answer

The SIOC congestion threshold is set too high. The SIOC congestion threshold is set too high, meaning that although congestion is detected, the threshold for applying throttling has not been reached. SIOC uses a congestion threshold (default 30ms) to determine when to throttle I/O. If the threshold is set too high, SIOC may detect congestion but not apply throttling because the latency has not exceeded the threshold. The administrator should lower the threshold to enable throttling.

Answer

The datastore is deduplicated

Answer

SIOC is disabled on the datastore

Answer

The host has exceeded the maximum number of concurrent I/Os

Question 14

An administrator is configuring persistent memory (PMem) for a critical database VM. The host has 512 GB of Intel Optane PMem. The VM must be able to vMotion while PMem is used. Which configuration meets this requirement?

Accepted Answer

Add a vPMem device to the VM and ensure the destination host has compatible PMem. To use PMem with a VM and still allow vMotion, you must add a virtual PMem (vPMem) device to the VM and ensure the destination host has compatible PMem. vPMem devices are backed by the host's PMem and are migrated as part of the VM's configuration, provided the destination host has PMem with compatible characteristics. This is the supported configuration for vMotion with PMem.

Answer

Use NVDIMM labels and create a datastore for PMem

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Configure the VM to use PMem in hardware passthrough mode

Answer

Emulate PMem using SSD-backed virtual disks

Question 15

Which TWO statements are true regarding vSAN deduplication and compression?

Accepted Answer

They are disabled by default on new vSAN clusters. Option B is correct because vSAN deduplication and compression are disabled by default when a new vSAN cluster is created; an administrator must explicitly enable them in the cluster's vSAN services settings. Option D is correct because deduplication and compression require an all-flash vSAN configuration (flash cache and flash capacity devices); they cannot be enabled on hybrid clusters. Option A is incorrect because deduplication and compression are enabled at the cluster level, not per-disk-group or per-VM, so the statement as worded is not one of the two true answers. Option C is incorrect because deduplication and compression work with RAID-1, RAID-5, and RAID-6 storage policies, not only RAID-1. Option E is incorrect because in vSAN, compression cannot be enabled independently of deduplication; enabling deduplication and compression is a single combined cluster-level setting.

Answer

They are enabled at the vSAN cluster level

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They can only be used with RAID-1 mirroring policies

Answer

Compression can be enabled independently of deduplication