📖 What is AWS Storage Gateway?
AWS Storage Gateway is a hybrid cloud storage service enabling on-premises applications to seamlessly utilize AWS cloud storage. It offers four gateway types: File, Volume, Tape, and Cached, providing access to scalable, durable, and cost-effective storage without application modifications.
"Understand the use cases for each gateway type. File Gateway supports SMB/NFS, Volume Gateway provides iSCSI block storage, and Tape Gateway offers virtual tape library (VTL) functionality. Exam questions frequently focus on selecting the appropriate gateway for specific data access patterns and recovery requirements."
📚 Certification: AWS Certified Solutions Architect - Associate (SAA-C03)
🔑 What are the Key Concepts of AWS Storage Gateway?
- ▸ File Gateway uses SMB/NFS protocols, allowing on-premises applications to access files stored in S3, simplifying file sharing and backup.
- ▸ Volume Gateway presents cloud storage as iSCSI volumes, enabling on-premises applications to use AWS storage for block-level access and disaster recovery.
- ▸ Tape Gateway provides a virtual tape library (VTL) interface, allowing existing backup software to utilize AWS for long-term archival storage.
- ▸ Cached Gateway stores frequently accessed data on-premises for low-latency access, while asynchronously backing up to AWS for durability.
- ▸ Local caching significantly impacts performance; understanding cache settings and eviction policies is crucial for optimizing Storage Gateway.
🎯 How does AWS Storage Gateway appear on the SAA-C03 Exam?
You may be asked to identify the best Storage Gateway type for a company needing to back up on-premises virtual machine images to AWS for long-term retention, considering cost and retrieval time.
A scenario might describe an application requiring low-latency access to frequently used files while maintaining durability in the cloud – determine the appropriate gateway and caching configuration.
Expect questions about choosing the correct gateway type when a business wants to migrate their existing tape-based backup system to a cloud-based solution without changing their backup software.
❓ Frequently Asked Questions
How does the choice of gateway type impact costs?
File and Tape Gateways primarily incur S3 storage costs. Volume Gateway has additional costs for snapshots and data transfer. Cached Gateway has costs for both local storage and S3 storage.
What are the implications of choosing between cached vs. stored volumes in Volume Gateway?
Cached volumes offer lower latency but require network connectivity to AWS. Stored volumes are fully stored in AWS, providing durability even with network outages, but with higher latency.
Can I use Storage Gateway to replicate data between two on-premises locations?
No, Storage Gateway is designed for hybrid cloud storage, connecting on-premises to AWS. For on-premises to on-premises replication, consider services like AWS DataSync or third-party solutions.