Author Archives: Colin Lynch

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About Colin Lynch

Technical Architect and Data Center Subject Matter Expert. I do not work or speak for Cisco or any other vendor.

AI Infrastructure at Scale: The Topology Decisions That Matter

A practical comparison of Rail-Only, Rail-Optimised Fat-Tree and traditional Clos network topologies for AI backend (East/West) Networks Modern AI infrastructure conversations are dominated by headline numbers. How many GPUs? How much HBM? How many terabits of bandwidth? How many tokens … Continue reading

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Edison’s Revenge: Why AI Data Centers Are Bringing DC Power Back

I love history, especially historical dramas like the 2017 film The Current War, which depicts the 19th century competition between Thomas Edison and George Westinghouse, assisted by Nikola Tesla, to decide which electrical power delivery system would be used in … Continue reading

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Get NVIDIA Certified!

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What Clothes is your Network wearing?

Thought of the Day Every so often a conversation crops up in our house that immediately sparks thoughts of a network analogy in my mind, or how every day occurrences keep you grounded and your ego in check, like ‘What … Continue reading

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Where’s the real cost consideration in your AI back‑end Network?

AI Thought of the Day Let’s talk about a myth I still hear far too often: “The network cost is generally about 10–15% of an AI build, and the difference in cost between an Infiniband and Ethernet backend fabric isn’t … Continue reading

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What’s next for AI Infrastructure?

Don’t worry if some of the terms below are new to you, I have linked my glossary here Over the last year or so I’ve had so many meetings, read so many papers, watched hundreds of hours of educational videos, … Continue reading

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Can thinking in 3’s Solve AI’s Power Problem?

As a network specialist for over 35 years , I can ‘think in binary’ can make quite complex subnet / supernet calculations in my head, from years of looking at IP addresses and immediately identifying whether they are on the … Continue reading

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Essential AI Terms: Your Comprehensive Glossary

I spend a lot of time explaining AI terms and acronyms in conversations particularly network related terms, so I decided to create a single reference post with the most common ones. If you’re starting your AI journey or just need … Continue reading

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Time to get blogging again!

Wow! just noticed it’s been a while since my last post. Took a blogging break during covid and then just never got back in the habit. Well time me-thinks to get back on the horse and start blogging again now … Continue reading

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Cisco HyperFlex vSphere Cluster Expansion

In this video I expand our Cisco HyperFlex cluster from 5 to 6 converged nodes.

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