VCP-DCV Configure and Manage vSphere Storage Practice Test 3 — 15 Questions

Question 1

Which TWO conditions require increasing the VMFS heap size on an ESXi host?

Accepted Answer

The host is connected to many VMFS datastores (e.g., 64). VMFS heap is used to track open file descriptors. Increasing the number of VMFS datastores (option A) increases the number of file descriptors needed, as does a large number of virtual machines (option D). Option B (large VMDK) does not directly increase the file descriptor count; it may require large file support but not heap. Option C (vSAN) does not use VMFS. Option E (many snapshots) increases file count, but the heap size is primarily adjusted for many datastores and many VMs, not snapshots per VM.

Answer

A virtual machine has a VMDK larger than 2 TB

Answer

The host is part of a vSAN cluster

Answer

The host has many snapshots per virtual machine

Question 2

Refer to the exhibit. An administrator runs the 'esxcli storage core device list' command and sees the output. The storage array is an active-passive array with ALUA. The current path selection policy is set to Fixed with no preferred path. What is the consequence of this configuration?

Accepted Answer

I/O may be sent to a non-optimized path, causing higher latency. With an active-passive ALUA array, the Fixed path selection policy without a preferred path means the host may not switch to the optimized active path for a given LUN. Since no preferred path is set, the host can select any available path, potentially sending I/O through a non-optimized passive path. This results in higher latency as the array must redirect I/O through the partner controller. Option C correctly identifies this consequence. Option A is incorrect because Fixed policy does not load-balance; it uses a single path unless it fails. Option B is wrong because ALUA is supported and the host can use multiple paths but only one is active. Option D is irrelevant as VMDKs can be used on any path.

Answer

The I/O is load-balanced across all four paths

Answer

ALUA is not supported, so the host will use only one path

Answer

The device cannot be used for VMDKs, only for RDM

Question 3

Refer to the exhibit. An administrator checks the vSAN cluster health and sees the above output. The cluster has been running for months. What is the most likely cause of the degraded objects?

Accepted Answer

A disk failure occurred and components are being rebuilt. Degraded objects in vSAN indicate that some components are unavailable and the system is rebuilding from redundant copies. This is typical after a disk failure, where the cluster automatically initiates resynchronization to restore fault tolerance. The cluster has been running for months, so a recent disk failure is the most likely cause. Option A correctly identifies this scenario. Option B (network partition) would typically show connectivity issues or 'Unreachable' objects, not degraded. Option C (disk group full) would show 'Absent' or 'No disk space' errors, not degraded. Option D (policy change) would cause reconfiguration but not necessarily degrade objects; objects would be marked as 'Compliant' after reconfiguration.

Answer

A storage policy was changed to increase redundancy

Answer

A disk group is full and needs capacity expansion

Answer

A network partition between hosts

Question 4

Refer to the exhibit. An administrator runs the 'vmkfstools -P -v 10' command on a datastore. What is the total capacity of the datastore?

Accepted Answer

3 TB. The vmkfstools -P -v 10 command displays the datastore's extent information. The output shows two extents: one with 1,048,576 blocks and another with 2,097,152 blocks, both using a 1 MB block size. Total blocks = 1,048,576 + 2,097,152 = 3,145,728 blocks. Since each block is 1 MB, total capacity = 3,145,728 MB = 3,072 GB = 3 TB. Therefore, option C (3 TB) is correct. Option A (2.5 TB) and Option B (2 TB) are incorrect; Option D (1 TB) matches only the smaller extent.

Answer

2.5 TB

Answer

2 TB

Answer

1 TB

Question 5

What is the maximum number of paths that vSphere supports for a single storage device?

Accepted Answer

32. vSphere supports up to 32 paths per storage device. 4 paths is common for some arrays, 8 is typical but not the maximum, and 256 is too high.

Answer

8

Answer

256

Answer

4

Question 6

An administrator notices that a VM with high I/O demands is experiencing performance issues because other VMs on the same datastore are consuming too many I/O operations. Which feature can be used to guarantee a minimum I/O share to this VM?

Accepted Answer

Storage I/O Control shares. Storage I/O Control (SIOC) allows setting shares, limits, and reservations to allocate I/O bandwidth per VM. Storage DRS balances I/O across datastores, not per-VM; multipathing selects paths; VM storage policies manage provisioning.

Answer

Multipathing policy

Answer

VM storage policy

Answer

Storage DRS

Question 7

What is the default block size of a VMFS5 datastore?

Accepted Answer

1 MB. VMFS5 uses a default block size of 1 MB. Larger block sizes are available but not default.

Answer

8 MB

Answer

2 MB

Answer

4 MB

Question 8

An administrator needs to migrate a VM from a VMFS5 datastore to a vSAN datastore while preserving the storage policy. Which migration method should be used?

Accepted Answer

Storage vMotion. Storage vMotion moves VM disks between datastores while preserving the storage policy association. vMotion moves compute only; cold migration requires downtime; clone creates a copy.

Answer

Cold migration

Answer

Clone

Answer

vMotion

Question 9

A vSphere cluster has multiple storage arrays with different capabilities. The administrator wants to automatically place VMs on datastores that match their storage policy. What is required?

Accepted Answer

VM storage policy and Storage DRS. Storage DRS uses VM storage policies to automatically place VMs on datastores that satisfy the policy requirements. SIOC is for I/O control; VASA provides capabilities but does not automate placement without Storage DRS.

Answer

VASA provider

Answer

Storage DRS only

Answer

Storage I/O Control

Question 10

An administrator attempts to expand a VMFS datastore by increasing the LUN size, but the expand option is grayed out. What could be the reason?

Accepted Answer

The LUN is shared with another datastore. If the LUN is shared with another datastore, it cannot be expanded because a LUN can belong to only one datastore. Block size does not affect expansion; RDMs are not used for VMFS; rescan is unrelated to the grayed-out option.

Answer

The datastore is using block size 2 MB

Answer

The host is not rescanned

Answer

The datastore is on a RDM

Question 11

An administrator wants to use Storage DRS to balance space usage across datastores. What must be configured?

Accepted Answer

Storage DRS automation level. The storage DRS automation level (manual, partially automated, fully automated) controls whether migration recommendations are generated or applied automatically. SIOC, policies, and host affinity are not required for space balancing.

Answer

Host affinity rules

Answer

SIOC

Answer

Storage policy

Question 12

Which feature allows a VM to use storage directly from the host's local disks, pooled across a cluster?

Accepted Answer

vSAN. vSAN pools local disks from multiple hosts into a shared datastore. VMFS is a filesystem, NFS is network storage, vFlash is caching.

Answer

VMFS

Answer

vFlash

Answer

NFS

Question 13

Which TWO of the following are required for vSphere Storage DRS to function?

Accepted Answer

vMotion enabled on the hosts. Storage DRS requires multiple datastores in a datastore cluster and vMotion to migrate VMs between them. SIOC, VASA, and storage policies are optional.

Answer

VM storage policies defined

Answer

VASA provider registered

Answer

SIOC enabled on each datastore

Question 14

Which TWO of the following are prerequisites for enabling jumbo frames on a vSphere host for storage traffic?

Accepted Answer

The VMkernel port must be configured with MTU 9000. Jumbo frames require physical switch support and VMkernel port MTU configuration. The storage array, guest OS, and vCenter do not directly affect host-level jumbo frame operation.

Answer

The virtual machine guest OS must support jumbo frames

Answer

The storage array must support jumbo frames

Answer

The vCenter Server must be configured for jumbo frames

Question 15

Which THREE of the following are characteristics of vSAN stretched clusters?

Accepted Answer

Provides site-level fault tolerance. Stretched clusters require a witness host in a third location, provide site-level fault tolerance, and require two fault domains (one per site). RAID 5/6 is supported but not unique to stretched clusters; it is still a single vSAN cluster.

Answer

Supports RAID 5/6 erasure coding

Answer

Uses a dedicated vSAN cluster separate from the main datastores