How Active-Active Data Centers Avoid the Second Failure

Episode 127 of Networking Tech with Fexingo dives into active-active data center designs, where both sites handle traffic simultaneously. Lucas and Luna explain why this topology is harder than active-passive, using the example of a mid-size financial exchange that lost both data centers in a cascading failure. They cover split-brain scenarios, the critical role of third-site quorum devices, and how link latency under five milliseconds shapes design choices. The episode also touches on the trade-off between resilience and complexity — and why some engineers argue active-active just doubles your chances of failure. A focused, engineer-level discussion on modern data center redundancy.

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