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Advanced Topic 36 of 50 DevOps & Tooling

Capacity Planning

Forecasting resources needed for demand.

How it works

Capacity planning estimates the resources a system needs to meet demand with an acceptable margin. It starts with measuring current usage of CPU, memory, storage, network and database connections, finds the limiting resource through load testing and projects growth from trends, seasonal peaks and planned launches. Headroom is added for failures, so a service that loses one zone still copes. Queueing theory explains why latency rises sharply as utilization nears 100 percent. Autoscaling handles short-term spikes while planning covers lead times, budgets and quotas.

Where it is used

Companies use it before product launches, sales events and migrations to avoid outages and avoid paying for idle hardware.

Common pitfall

Planning from averages rather than peaks, ignoring hidden bottlenecks such as a database or a third-party limit and trusting untested autoscaling all cause failures. Load test regularly and review forecasts against reality.

Where it fits in the course

Capacity Planning is topic 36 of 50 in DevOps & Tooling, rated Advanced. It follows SLIs, SLOs and SLAs. The next topic is Cost Optimization.

Practice and explore

How to study this topic

  1. Read the explanation above and restate the definition in your own words.
  2. Open the interactive lesson and answer its mini quiz.
  3. Read the common pitfall, then write a short example that avoids it.
  4. Check your understanding in the DevOps & Tooling quiz, and revisit the topic if you miss a question.

Frequently asked questions

What is Capacity Planning?
Forecasting resources needed for demand. It belongs to DevOps & Tooling and is an advanced-level topic.
Where do people use Capacity Planning?
Companies use it before product launches, sales events and migrations to avoid outages and avoid paying for idle hardware.
What is the most common mistake with Capacity Planning?
Planning from averages rather than peaks, ignoring hidden bottlenecks such as a database or a third-party limit and trusting untested autoscaling all cause failures.
What should I learn before this topic?
Start with SLIs, SLOs and SLAs, the topic just before it in DevOps & Tooling.
How can I practice it?
Answer the mini quiz in the interactive lesson, then take the DevOps & Tooling quiz.
Is Capacity Planning hard to learn?
It is an Advanced topic. Expect to read the explanation more than once and to connect it with earlier topics. Working through a small example by hand helps most.
How long does it take to learn Capacity Planning?
Most learners can read the explanation and finish the interactive lesson in under an hour. Fluency comes from applying the idea, so plan a few short practice sessions with the quiz.
Which topics are related to Capacity Planning?
SLIs, SLOs and SLAs, Cost Optimization, Postmortems are closely connected. The full list is in the related topics section of this page.
What should I study after Capacity Planning?
Continue with Cost Optimization, the next topic in DevOps & Tooling.

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