---
title: "Discussion on \"One zone in London lost power. Why wasn't that a small problem?\" | Hashnode"
description: "Discussion on \"One zone in London lost power. Why wasn't that a small problem?\". On 20 Oct a power event took out one zone of Google Cloud's London region, and some services across the region had errors in an incident that lasted about 8 hours. What zones, regions and providers each protect you from, and a design that keeps worki"
url: "https://hashnode.com/posts/one-zone-in-london-lost-power-why-wasnt-that-a-small-problem/6ad8761a0778650e60148b8f"
---

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# [One zone in London lost power. Why wasn't that a small problem?](https://systemdesignacademy.hashnode.dev/one-zone-in-london-lost-power-why-wasnt-that-a-small-problem?utm_source=hashnode&utm_medium=feed)

On 20 Oct a power event took out one zone of Google Cloud's London region, and some services across the region had errors in an incident that lasted about 8 hours. What zones, regions and providers each protect you from, and a design that keeps worki

Oct 21 · 12 min read · systemdesignacademy.hashnode.dev  
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-   [#system-design](https://hashnode.com/tag/system-design)
-   [#google-cloud-platform](https://hashnode.com/tag/google-cloud-platform)
-   [#cloud-computing](https://hashnode.com/tag/cloud-computing)
-   [#high-availability](https://hashnode.com/tag/high-availability)
-   [#distributed-systems](https://hashnode.com/tag/distributed-systems)

## Written by

[RONI DAS](https://hashnode.com/@ronidas)

@ronidas · India

  
[View profile](https://hashnode.com/@ronidas)

AI engineering, agentic memory, machine learning, and system design at scale.

I work on AI systems and the infrastructure they actually run on: agentic architectures, memory for agents, retrieval, and the graph and data layers that keep model output grounded in something real. Formerly at Neo4j. I also write and teach the systems side that most AI content skips, from distributed systems and databases to the design decisions that decide whether a model ever reaches production. I run Total Technology Zonne on YouTube and I am building systemdesign.academy, an interactive course on system design, machine learning, and AI engineering, covering the parts most tutorials leave as an exercise for the reader. Mock interviews and prep packs: topmate.io/roni

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