SAP-C02 Q347 · Compute

Question

A solutions architect has launched multiple Amazon EC2 instances in a placement group within a single Availability Zone. Because of additional load on the system, the solutions architect attempts to add new instances to the placement group. However, the solutions architect receives an insufficient capacity error. What should the solutions architect do to troubleshoot this issue?

Accepted Answer

**Answer B: Stop and start all instances in the placement group, then try the launch again.**

Here's the step-by-step reasoning:

1. **Why the error occurs**: A **cluster placement group** (the default when launching in a single AZ for low-latency networking) packs instances onto the same underlying hardware rack. When you try to add new instances, AWS may not have enough contiguous capacity on the **same rack/hardware** where existing instances are running.

2. **How stop-and-start fixes it**: When you **stop and start** (not reboot) all instances in the placement group, AWS re-provisions them on fresh underlying hardware. This gives AWS the opportunity to find a hardware cluster that has **enough capacity for ALL instances** — both the existing ones and the new ones you want to add.

3.

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🏗️ Architecture

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