VCP-DCV vSphere Performance and Scaling Practice Question
Which TWO storage performance best practices should be followed when scaling a vSphere environment using shared storage? (Choose 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) on datastores to manage I/O latency.
Using multiple paths with round-robin load balancing improves throughput and redundancy. Storage I/O Control (SIOC) manages latency and prevents a single VM from monopolizing storage. VMFS-3 is outdated and should be avoided. RDM in physical compatibility mode is rarely recommended. vSphere Flash Read Cache is deprecated.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Use Raw Device Mapping in physical compatibility mode for virtual machines.
Why it's wrong here
Physical compatibility mode is rarely recommended; virtual compatibility mode is preferred for snapshots and vMotion.
- ✓
Enable Storage I/O Control (SIOC) on datastores to manage I/O latency.
Why this is correct
SIOC automatically manages storage queues to maintain latency thresholds.
- ✓
Configure multiple storage paths with round-robin load balancing policy.
Why this is correct
Round-robin path policy provides load balancing and failover for storage I/O.
- ✗
Deploy vSphere Flash Read Cache to reduce read latency.
Why it's wrong here
vSphere Flash Read Cache is deprecated and not recommended for new deployments.
- ✗
Use VMFS-3 for large datastores to reduce seek time.
Why it's wrong here
VMFS-3 is outdated; VMFS-5/6 are current and support larger volumes and better performance.
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