VCP-DCV Configure and Manage vSphere Storage Practice Question
A company is deploying a high-performance database workload on vSphere. The storage array supports NVMe over RDMA (NVMe-oF) and iSCSI. The workload requires extremely low latency and high IOPS. The network is dedicated 25 Gbps Ethernet with RoCE v2 support. Which storage protocol should be recommended, and why?
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
✓
NVMe over RDMA, because it provides direct memory access and lower CPU overhead
NVMe over RDMA (NVMe-oF) is recommended because it leverages RDMA to provide direct memory access, reducing CPU overhead and achieving extremely low latency and high IOPS. This aligns with the workload's requirements and the dedicated 25 Gbps RoCE v2 network. In contrast, NFS (option A) is a file-level protocol with higher overhead and does not offer the same performance. Fibre Channel (option C) requires specialized hardware and is not as efficient as NVMe-oF over RoCE. iSCSI (option D) relies on TCP/IP, which introduces higher latency and CPU overhead compared to RDMA.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
NFS, because it supports advanced features like Storage DRS
Why it's wrong here
NFS is file-level and not optimal for block-level database workloads.
- ✓
NVMe over RDMA, because it provides direct memory access and lower CPU overhead
Why this is correct
NVMe-oF with RDMA reduces latency and CPU utilization.
- ✗
Fibre Channel, because it is the fastest protocol available
Why it's wrong here
Fibre Channel can be fast but requires separate FC infrastructure; NVMe-oF can use existing Ethernet.
- ✗
iSCSI, because it is simpler to configure and does not require RDMA support
Why it's wrong here
iSCSI has higher latency and CPU overhead, not ideal for extreme performance.
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