VCP-DCV Configure and Manage vSphere Storage — Timed 10 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?

Accepted Answer

Configure the NFS datastore to use vStorage APIs for Array Integration (VAAI).. Option D is correct because 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.

Answer

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.. Option C is correct because 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.

Answer

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 company is designing a vSphere environment for a critical database application. The storage array supports both Fibre Channel (FC) and iSCSI. The application requires low latency and high IOPS. Which storage protocol and path policy should be recommended?

Accepted Answer

FC with Round Robin path policy.. FC provides lower latency and higher IOPS than iSCSI due to dedicated hardware and lower protocol overhead, making it ideal for critical database workloads. The Round Robin path policy is recommended for FC with active-active storage arrays because it distributes I/O across all available paths, maximizing throughput and load balancing, which aligns with the requirement for high IOPS.

Answer

FC with Fixed path policy.

Answer

FC with Most Recently Used (MRU) path policy.

Answer

iSCSI with Round Robin path policy.

Question 4

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.. Option C is correct because 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.

Answer

All hosts must have identical CPU models.

Answer

A shared storage array accessible by all hosts.

Question 5

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.. Option A is correct because 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 6

Which storage feature in vSphere allows a VM to be migrated from one datastore to another without any downtime?

Accepted Answer

Storage vMotion. Storage vMotion is the correct answer because it enables live migration of a virtual machine's virtual disk files from one datastore to another with zero downtime. It uses a mirrored copy mechanism where the source and destination datastores are synchronized before the VM is switched to the destination, ensuring continuous VM availability.

Answer

vMotion

Answer

Distributed Resource Scheduler (DRS)

Answer

Storage DRS

Question 7

A vSphere administrator is observing that a VM with a 2 TB thin-provisioned virtual disk on a VMFS6 datastore is reporting 1.5 TB of used space inside the guest OS, but the datastore shows only 800 GB consumed by the VM. What is the most likely cause of this discrepancy?

Accepted Answer

The virtual disk is thin-provisioned, so only the actual written blocks consume space on the datastore.. The discrepancy is because the virtual disk is thin-provisioned. Thin provisioning means the virtual disk file (VMDK) on the datastore only occupies space for blocks that have been written to by the guest OS, not the full allocated size. The guest OS reports 1.5 TB of used space because it sees the logical file system usage, but the datastore only shows 800 GB consumed because that is the actual physical storage used by the written blocks.

Answer

The virtual disk needs to be defragmented to reclaim space.

Answer

The VM has a snapshot that is consolidating, reducing storage usage.

Answer

The virtual disk is thick-provisioned lazy zeroed, which delays allocation.

Question 8

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

Answer

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

Question 9

A vSphere environment uses an iSCSI storage array with multiple targets. The administrator configures CHAP authentication but some hosts fail to connect. The working hosts are configured with mutual CHAP, while the failing hosts use only one-way CHAP. What is the most likely reason for the failures?

Accepted Answer

The storage array requires mutual CHAP, but the failing hosts are configured for one-way CHAP.. The correct answer is B because mutual CHAP requires the target to authenticate the initiator and the initiator to authenticate the target. If the storage array is configured to require mutual CHAP, hosts using only one-way CHAP will fail to complete the authentication handshake. The working hosts are configured with mutual CHAP, confirming the array enforces mutual authentication.

Answer

The CHAP secret is not set on the failing hosts.

Answer

The iSCSI target name is incorrect on the failing hosts.

Answer

The storage array is configured to use only one-way CHAP.

Question 10

A company runs a critical SQL Server VM on vSphere 7.0. The VM has a single 300 GB virtual disk on a VMFS6 datastore backed by a SAN with 8 Gbps Fibre Channel. The VM is configured with 16 vCPUs and 64 GB RAM. Recently, users have reported slow query performance. The administrator checks the datastore performance and sees average latency of 15 ms with peaks of 50 ms during business hours. The storage array has multiple paths to the ESXi host, and the current path policy is Fixed with a single active path. The administrator wants to improve storage performance with minimal cost. Which action should the administrator take first?

Accepted Answer

Change the path selection policy to Round Robin on the ESXi host.. The current Fixed path policy with a single active path underutilizes the available storage bandwidth, causing high latency during peak I/O. Changing to Round Robin (RR) distributes I/O across all available paths, reducing queue depth on any single path and lowering latency without any hardware cost. This is the most immediate and cost-effective fix for the observed performance issue.

Answer

Add a vSphere Flash Read Cache to the VM.

Answer

Upgrade the Fibre Channel infrastructure to 16 Gbps.

Answer

Convert the virtual disk to thin provisioning to reduce I/O.