3V0-21.23 · Question #83
An architect is tasked with designing a new VMware software-defined data center (SDDC) using VMware vSAN. The architect uses a storage assessment tool to determine the storage requirements for the…
The correct answer is C. The existing network is 10 GbE capable. Option C is correct because VMware recommends a minimum of 25 GbE networking for all-NVMe vSAN configurations - the high throughput of NVMe drives can easily saturate 10 GbE links, creating a network bottleneck that undermines the performance the NVMe hardware is designed to…
Question
An architect is tasked with designing a new VMware software-defined data center (SDDC) using VMware vSAN. The architect uses a storage assessment tool to determine the storage requirements for the new vSAN cluster. The new SDDC is going to be deployed into the existing data center and must be connected to a shared core network switch. The architect decides to use vSAN ReadyNodes with the following configuration:
Two disk groups with:
- Write Intensive NVMe 800 GB drive for cache
- Four 3.84 TB Mixed Use NVMe for capacity
- Four 10 GbE ports
Which element represents a risk that should be included in this design?
Options
- AThe number of 10 GbE capable ports in the vSAN ReadyNode
- BThe use of vSAN ReadyNodes
- CThe existing network is 10 GbE capable
- DThe use of NVMe drives for cache and capacity
How the community answered
(38 responses)- A5% (2)
- B26% (10)
- C55% (21)
- D13% (5)
Explanation
Option C is correct because VMware recommends a minimum of 25 GbE networking for all-NVMe vSAN configurations - the high throughput of NVMe drives can easily saturate 10 GbE links, creating a network bottleneck that undermines the performance the NVMe hardware is designed to deliver. Connecting to an existing core switch that is only 10 GbE capable means the network becomes the weakest link in the design, and this bandwidth constraint is a legitimate architectural risk.
Why the distractors are wrong:
- A is not a risk - four 10 GbE ports on the ReadyNode is a valid configuration that allows for redundancy and NIOC traffic separation within the node itself.
- B is not a risk - vSAN ReadyNodes are pre-validated, VMware-certified hardware; using them is actually a best practice that reduces risk.
- D is not a risk - using NVMe for both cache and capacity is a fully supported, high-performance vSAN all-NVMe configuration.
Memory tip: "Fast drives need fast pipes." Whenever you see all-NVMe vSAN on an exam, immediately flag any mention of 10 GbE as a potential bottleneck - NVMe throughput demands 25 GbE or higher per VMware's design guidance.
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