# Scalability Calculations

## Requirement

Design an architecture capable of handling **15,000 requests per second**.

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## Container Capacity

Each container can handle:

- **500 requests/second**

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## Required Containers

Without safety margin:

15000 / 500 = 30 containers

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## Safety Margin

A 30% safety margin is required.

30 × 1.3 = 39 containers

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## Final Result

**39 containers** are required to safely handle the expected traffic.

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# Cold Start Strategy

To reduce startup latency for new containers:

- Keep 2–3 warm containers ready.
- Use lightweight Docker images.
- Configure health checks before routing traffic.
- Trigger auto-scaling at 70% CPU or 80% memory utilization.

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# Using Ghaymah Block Storage

Ghaymah Block Storage is used for stateful workloads where data must persist even if containers are recreated.

Typical use cases include:

- PostgreSQL
- MySQL
- MongoDB
- Application uploads
- Persistent logs
- Backup storage

Application containers remain stateless, while persistent data is stored on Block Storage.