VCP-DCV Configure and Manage vSphere Storage — 20 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?

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

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 Option B (NFS v2) is obsolete and lacks modern features.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.

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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.

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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

Question 11

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.. 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.

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The CHAP secret is not set on the failing hosts.

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The iSCSI target name is incorrect on the failing hosts.

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

Question 12

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.

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Add a vSphere Flash Read Cache to the VM.

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Upgrade the Fibre Channel infrastructure to 16 Gbps.

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

Question 13

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.

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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.

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

Question 14

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.

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Upgrade the datastore from VMFS5 to VMFS6.

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

Question 15

A company uses vSphere 7.0 with two ESXi hosts in a cluster. All virtual machines (VMs) are stored on a VMFS6 datastore backed by a single LUN from a mid-range SAN. The LUN is presented to both hosts and both hosts have identical multipathing configuration. Recently, an administrator noticed that one host shows the datastore as "Inactive" while the other host can access it normally. The administrator verifies that both hosts have connectivity to the SAN, the LUN is visible to both hosts, and the storage array reports the LUN as online. The administrator wants to restore access to the datastore on the affected host without disrupting VMs running on the other host. Which action should the administrator take?

Accepted Answer

Perform a storage rescan on the affected host.. The datastore showing as 'Inactive' on one host while remaining accessible on the other indicates a path failure or a transient storage connectivity issue at the host level, not a permanent problem with the LUN or array. Performing a storage rescan on the affected host forces the ESXi host to re-evaluate all storage paths and re-register the datastore, restoring access without impacting VMs on the other host. This is the safest and least disruptive action because it does not require a reboot, multipathing policy change, or unmounting the datastore.

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Reboot the affected ESXi host.

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Change the multipathing policy on the affected host to Round Robin.

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Unmount the datastore from the affected host and then remount it.

Question 16

Sequence the steps to configure a DRS rule that keeps two VMs on different hosts.

Accepted Answer

Access cluster configuration, then add a new DRS rule, then provide a name for the rule, then select 'Separate VMs' as the type, then assign the two VMs.. The correct sequence to configure a DRS rule that keeps two VMs on different hosts is: first access the cluster configuration, then add a new DRS rule, then name the rule, then choose the 'Separate VMs' type to enforce host separation, and finally assign the two VMs. This order ensures that each step logically follows the previous one, adhering to the typical workflow in vSphere where the rule is created before its properties are defined and applied.

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Access cluster configuration, then add a new DRS rule, then select 'Separate VMs' as the type, then assign the two VMs, then provide a name for the rule.

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Access cluster configuration, then provide a name for the rule, then add a new DRS rule, then select 'Separate VMs' as the type, then assign the two VMs.

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Access cluster configuration, then add a new DRS rule, then assign the two VMs, then provide a name for the rule, then select 'Separate VMs' as the type.

Question 17

Place the steps to create a resource pool in a cluster.

Accepted Answer

Right-click cluster, select New Resource Pool, name the resource pool, set CPU and memory resources (shares, reservation, limit), configure expandable reservation (optional), click OK.. Creating a resource pool in a vSphere cluster involves first initiating the creation by right-clicking the cluster and selecting New Resource Pool, then providing a name, followed by configuring CPU and memory resources including shares, reservation, and limit, optionally enabling expandable reservation, and finally confirming by clicking OK. This sequence ensures all required parameters are set before finalizing the resource pool.

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Right-click cluster, select New Resource Pool, set CPU and memory resources (shares, reservation, limit), name the resource pool, configure expandable reservation (optional), click OK.

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Right-click cluster, select New Resource Pool, name the resource pool, set CPU and memory resources (shares, reservation, limit), click OK, configure expandable reservation (optional).

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Right-click cluster, select New Resource Pool, name the resource pool, configure expandable reservation (optional), set CPU and memory resources (shares, reservation, limit), click OK.

Question 18

Match each VMware acronym to its full name.

Accepted Answer

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

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ESXi: VMware vCenter Server is a centralized management platform.

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vSphere: VMware VMFS is a clustered file system.

Question 19

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.

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Virtual machine - max vCPUs per VM: 128

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Datastore - max size: 32 TB

Question 20

An administrator is configuring a vSAN cluster with all-flash capacity. The cluster uses RAID-5 erasure coding with a policy of 'Number of failures to tolerate = 1' (PFTT=1). The administrator wants to minimize storage overhead while ensuring availability. Which vSAN storage policy setting should be used?

Accepted Answer

Set 'Primary level of failures to tolerate' to 1 and 'Primary level of failures to tolerate method' to 'RAID-5 (Erasure Coding)'. For all-flash vSAN, RAID-5/6 erasure coding is recommended. With PFTT=1, RAID-5 requires only 1 parity component, minimizing overhead. Option C is correct. Option A (RAID-1 mirroring) would use more capacity. Option B (RAID-6) is for PFTT=2 and adds more overhead. Option D (no redundancy) is not fault tolerant.

Answer

Set 'Primary level of failures to tolerate' to 1 and 'Primary level of failures to tolerate method' to 'RAID-1 (Mirroring)'

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Set 'Primary level of failures to tolerate' to 2 and 'Primary level of failures to tolerate method' to 'RAID-6 (Erasure Coding)'

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Set 'Primary level of failures to tolerate' to 0