SAA-C03 Q110 · DR

Question

A large financial services company uses Amazon ElastiCache (Redis OSS) for its new application that has a global user base. A solutions architect must develop a caching solution that will be available across AWS Regions and include low-latency replication and failover capabilities for disaster recovery (DR). The company's security team requires the encryption of cross-Region data transfers. Which solution meets these requirements with the LEAST amount of operational effort?

Accepted Answer

**Option B: Create a global data store in ElastiCache (Redis OSS)** meets every requirement with minimal operational effort:

1. **Cross-Region availability**: Global data store is a native ElastiCache feature that allows you to create a primary cluster in one Region and up to two secondary (replica) clusters in different Regions. This is a fully managed, built-in capability — no custom replication pipelines needed.

2. **Low-latency replication**: Global data store uses asynchronous cross-Region replication with typical latency under 1 second. Redis replication streams are optimized for this purpose, unlike bolt-on solutions.

3. **Failover / DR capability**: When DR is required, you can **promote a secondary cluster to primary**. This is a single API call or console action. The promoted

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📘 Key Concepts

🏗️ Architecture

⚙️ Operations

💰 Cost

🔒 Security

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