VCP-DCV Storage I/O Control (SIOC) Practice Question
Which TWO options are valid methods to reduce vSphere storage latency? (Select two.)
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
✓
Enable Storage I/O Control (SIOC).
Correct answers are A (Enable Storage I/O Control) and B (Increase the number of storage adapters). SIOC manages I/O queues and prioritizes critical VMs, reducing latency during contention. More storage adapters increase parallelism, allowing more concurrent I/O operations and reducing wait times. Option C (VMFS-6 automatic space reclamation) improves storage efficiency but does not directly reduce latency. Option D (larger block sizes) can help sequential throughput but may increase latency for random I/O. Option E (vSAN deduplication and compression) adds CPU overhead that can increase latency.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Enable Storage I/O Control (SIOC).
Why this is correct
SIOC provides I/O prioritization to reduce latency for important VMs.
- ✓
Increase the number of storage adapters.
Why this is correct
More adapters increase I/O parallelism, reducing latency.
- ✗
Use VMFS-6 with automatic space reclamation.
Why it's wrong here
Space reclamation improves storage efficiency, not latency.
- ✗
Use larger block sizes in VMFS.
Why it's wrong here
Larger block sizes can improve sequential throughput but not reduce latency.
- ✗
Use vSAN with deduplication and compression.
Why it's wrong here
Dedup/compression can increase CPU overhead and latency.
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Written by Johnson Ajibi, MSc IT Security
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