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Cisco 300-610 Exam - Topic 5 Question 123 Discussion

A Cisco engineer is analyzing a customer environment where dozens of VMs are running on a physical server and UCS chassis are cascaded The setup uses two ISLs in a port channel to the SAN switch (per fabric) The oversubscription from VM to physical SAN port is often 20 (VMs/host) x 72 (9 UCS chassis cascaded = 72 hosts): 2 (ISLs from fabric interconnect to SAN switch port on the NPV core (NPIV enabled switch) This results to 20 x 72 2 per single ISL = 720 VMs per ISL20 (VMs per host) x 8 (hosts per chassis) x 9 (chassis per port channel to SAN switch) / 2 (ISLs per port channel) = 20 x 8 x 9 / 2 = 720 VMs per SAN F-port What is the best way to resolve possible IOPS bottleneck?
C) Configure 802 1Qbb priority flow control
A) Deploy a content delivery network
B) Enable Windows 1Gb server full duplex
D) Remove data encryption on the SSD

Cisco 300-610 Exam - Topic 5 Question 123 Discussion

Actual exam question for Cisco's 300-610 exam
Question #: 123
Topic #: 5
[All 300-610 Questions]

A Cisco engineer is analyzing a customer environment where dozens of VMs are running on a physical server and UCS chassis are cascaded The setup uses two ISLs in a port channel to the SAN switch (per fabric) The oversubscription from VM to physical SAN port is often 20 (VMs/host) x 72 (9 UCS chassis cascaded = 72 hosts): 2 (ISLs from fabric interconnect to SAN switch port on the NPV core (NPIV enabled switch) This results to 20 x 72 2 per single ISL = 720 VMs per ISL

20 (VMs per host) x 8 (hosts per chassis) x 9 (chassis per port channel to SAN switch) / 2 (ISLs per port channel) = 20 x 8 x 9 / 2 = 720 VMs per SAN F-port What is the best way to resolve possible IOPS bottleneck?

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Suggested Answer: C

by Jacob at Apr 08, 2026, 09:31 AM

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Rasheeda
3 days ago
Overall, C is the safest bet for optimizing performance.
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Rasheeda
8 days ago
D is risky. Removing encryption might expose data vulnerabilities.
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Ashlyn
13 days ago
I feel like B could help too, but it’s not the main issue here.
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Broderick
19 days ago
Option A seems off. A CDN won't help with IOPS bottlenecks.
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Glory
24 days ago
I agree, C makes sense. Flow control can reduce congestion.
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Lettie
29 days ago
I think option C is the best choice. Prioritizing traffic can help manage IOPS better.
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Goldie
1 month ago
720 VMs per ISL? Wow, that sounds like a recipe for disaster!
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Domonique
1 month ago
Totally agree, prioritizing flow control makes sense here!
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Kirby
1 month ago
Not sure about removing encryption, seems risky.
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Bonita
2 months ago
I think option C is the way to go for IOPS issues.
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Mona
2 months ago
That's a crazy number of VMs per ISL!
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Enola
2 months ago
Not sure if 720 VMs per ISL is sustainable long-term.
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Markus
2 months ago
Totally agree with C, flow control is key here.
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Haley
2 months ago
Wait, removing data encryption? That sounds risky!
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Carlene
4 months ago
I think option C is the way to go.
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Margurite
4 months ago
That's a crazy amount of VMs per ISL!
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Kristel
5 months ago
I feel like enabling full duplex on the server could help, but I’m not convinced it’s the best solution for a bottleneck caused by oversubscription.
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Alyce
5 months ago
I’m a bit confused about the impact of removing data encryption on SSDs. Would that really improve IOPS, or is it more about the data transfer rate?
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Dalene
5 months ago
This question seems similar to one we practiced about optimizing SAN performance. I think configuring priority flow control might help with congestion.
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Yuriko
5 months ago
I remember we discussed IOPS bottlenecks in class, but I'm not entirely sure which option directly addresses the issue here.
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