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

Question 1

A vSAN cluster has two fault domains. What is the maximum number of host failures that can be tolerated if the cluster is configured with a storage policy that sets 'Number of failures to tolerate' to 2?

10 minute time limit — choose an answer to begin.

Accepted Answer

1. With only two fault domains, the vSAN cluster cannot support a storage policy with FTT=2. The formula for fault domains requires at least 2*FTT+1 = 5 fault domains to tolerate 2 host failures. With only 2 fault domains, the maximum number of host failures that can be tolerated is 1, as replicas can be placed in different fault domains, but any two failures could potentially affect all copies.

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2

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3

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4

Question 2

An administrator needs to provision an NFS datastore for VMs that require high performance and low latency. The storage array supports multiple NFS versions. Which NFS version should be selected for the best performance?

Accepted Answer

NFS v4.1. NFS version 4.1 is the most advanced and offers features like parallel NFS (pNFS) and sessions, which improve performance and fault tolerance. Option B (NFS v2) is obsolete and lacks modern features. Option C (NFS v4.0) does not include pNFS and session support found in v4.1. Option D (NFS v3) is widely used but lacks the performance enhancements of v4.1 such as compound operations and sessions.

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NFS v2

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NFS v4.0

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NFS v3

Question 3

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).. 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.

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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 4

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.

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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.

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Perform a storage vMotion of the VM to another datastore.

Question 5

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.

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FC with Fixed path policy.

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FC with Most Recently Used (MRU) path policy.

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iSCSI with Round Robin path policy.

Question 6

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.

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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 7

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.

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The virtual disk must not be attached to a snapshot.

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The storage array must support VAAI.

Question 8

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.

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vMotion

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Distributed Resource Scheduler (DRS)

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Storage DRS

Question 9

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.

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The virtual disk needs to be defragmented to reclaim space.

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

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

Question 10

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

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esxcli storage vmfs grow -l naa.60050768018603e1b800000000000001

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