VCP-DCV vSphere Performance and Scaling Practice Question
An administrator wants to ensure that a critical database VM has consistent low-latency access to its virtual disks. The VM currently resides on a datastore backed by a hybrid array. Which configuration change best meets this requirement?
⚠ Common exam trap
Many candidates confuse I/O management features (SIOC, multipathing) with storage media performance, thinking they can compensate for the inherent latency of HDDs in a hybrid array, but only a flash-based storage policy directly addresses the requirement for consistent low-latency access.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Create a VM storage policy that requires flash-based storage and apply it to the VM.
Creating a VM storage policy that requires flash-based storage and applying it to the VM ensures that the virtual disks are placed on an all-flash datastore, which provides consistent low-latency access. This leverages vSphere Storage Policy-Based Management (SPBM) to enforce placement on flash media, eliminating the variable latency introduced by the HDD tier in a hybrid array.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Create a VM storage policy that requires flash-based storage and apply it to the VM.
Why this is correct
A storage policy with rule set for flash ensures placement on low-latency storage.
- ✗
Configure the VM to use multiple paths with Round Robin policy.
Why it's wrong here
Path policy affects throughput, not latency.
- ✗
Assign a separate VMDK for each critical VM on a dedicated datastore.
Why it's wrong here
This is not a standard practice and does not guarantee low latency.
- ✗
Enable Storage I/O Control (SIOC) on the datastore.
Why it's wrong here
SIOC manages congestion but does not improve underlying latency.
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Senior Network & Security Engineer · founder of Courseiva
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