Exam 3V0-23.25 Topic 1 Question 28 Discussion

Actual exam question for VMware's 3V0-23.25 exam
Question #: 28
Topic #: 1

A Solutions Architect is calculating the network bandwidth saturation for a specific VMDK under heavy write load in a vSAN ESA cluster. The available Top-of-Rack switch throughput is limited to
25 GbE.
The VM generates 500 MB/s of raw write data.
The architect evaluates two different Storage Policies applied to this specific VM:
```
[SPBM Configuration Options]
Policy A: Failures To Tolerate: 1 (RAID-1 Mirroring)
Policy B: Failures To Tolerate: 1 (RAID-5 Erasure Coding)
```
How do these different SPBM policies directly alter the actual "on-the-wire" network traffic profile for vSAN, and what is the impact on the 25 GbE fabric? (Select all that apply.)

A. Both policies consume zero network bandwidth for reads when the "Site Locality" feature is enabled. B. Policy A (RAID-1) generates 1000 MB/s of total backend network traffic (a 2.0x multiplier) because the DOM Client must simultaneously send the 500 MB/s data payload to both Mirror 1 and Mirror 2 across the network. C. Switching from Policy A to Policy B doubles the network traffic overhead because RAID-5 requires a 4th parity node. D. vSAN ESA compresses the data BEFORE it leaves the host (DOM Client level); therefore, if the VM generates highly compressible data (e.g., 2:1 ratio), Policy B will only push ~332 MB/s across the network, preserving the 25 GbE switch buffers. E. Policy B (RAID-5) significantly reduces the network bandwidth multiplier compared to RAID-1, because the erasure coding algorithm spreads parity overhead (1.33x) rather than duplicating the full dataset.

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