Mastering Hybrid Storage: AWS Solutions for On-Premises Integration

This study guide covers the critical strategies and services used to bridge on-premises data centers with the AWS Cloud, ensuring low-latency access, seamless migration, and cost-effective durability.

Learning Objectives

After studying this guide, you should be able to:

• Identify the three main types of AWS Storage Gateway and their specific use cases.
• Differentiate between online data transfer tools (AWS DataSync) and managed file transfer protocols (AWS Transfer Family).
• Design a hybrid storage architecture that meets RTO/RPO requirements for backup and disaster recovery.
• Select the most cost-effective storage tiering strategy for hybrid workloads.
• Evaluate network requirements (VPN vs. Direct Connect) for hybrid storage performance.

Key Terms & Glossary

• Hybrid Cloud Storage: An architecture that links on-premises applications to cloud-based storage systems, allowing for a shared data environment.
• AWS Storage Gateway: A set of hybrid cloud storage services that give you on-premises access to virtually unlimited cloud storage.
• AWS DataSync: An online data transfer service that simplifies, automates, and accelerates moving data between on-premises storage and AWS storage services.
• NFS/SMB Protocols: Standard file sharing protocols used by File Gateway to allow local applications to communicate with Amazon S3.
• iSCSI: Internet Small Computer Systems Interface; the protocol used by Volume Gateway to present block storage to local servers.

The "Big Idea"

Hybrid storage isn't just about moving data to the cloud; it's about extending your data center. By utilizing hybrid solutions, organizations can maintain the low latency of local hardware for active workloads while leveraging the massive scale, durability ($99.999999999%$), and cost-optimization (tiering) of the AWS Cloud. It serves as the "bridge" that enables gradual migration and robust disaster recovery without requiring a complete re-architecting of legacy on-premises applications.

Formula / Concept Box

Hierarchical Outline

1. AWS Storage Gateway Family
   • File Gateways: Provides a file interface to S3 or FSx for Windows.
     • Local Caching: Stores frequently accessed data locally for low-latency performance.
   • Volume Gateways: Provides block storage (iSCSI) to local applications.
     • Stored Volumes: Entire dataset is local; backed up as EBS snapshots.
     • Cached Volumes: Cloud is primary; only active data is local.
   • Tape Gateway: Virtual Tape Library (VTL) for legacy backup software.
2. Data Migration & Ingestion
   • AWS DataSync: Automated, high-speed transfer over the network.
     • Use Case: Large-scale migrations or recurring data synchronization.
   • AWS Transfer Family: Managed support for SFTP, FTPS, and FTP.
     • Integration: Directly maps to S3 or EFS.
3. Connectivity Essentials
   • AWS Direct Connect: Dedicated private network connection for consistent performance.
   • AWS Site-to-Site VPN: Encrypted tunnel over the public internet (faster to setup).

Visual Anchors

Decision Tree: Choosing a Hybrid Service

Hybrid Architecture Overview

\begin{tikzpicture}[node distance=2cm, every node/.style={draw, rectangle, align=center, minimum height=1cm}] % On-Premises \node (OnPrem) [fill=gray!20] {\textbf{On-Premises}\Data Center}; \node (Server) [below of=OnPrem, yshift=0.5cm] {Local Application\Server}; \node (Gateway) [right of=Server, xshift=2cm, fill=blue!10] {AWS Storage\Gateway (Appliance)};

\end{tikzpicture}

Definition-Example Pairs

• Cached Volumes: A configuration where data is stored in Amazon S3 and only a subset of recently accessed data is kept in the local gateway's cache.
  • Example: A video production house stores 500TB of raw footage in S3 but keeps the 2TB currently being edited on the local gateway for fast access.
• Stored Volumes: A configuration where the entire dataset is stored on-premises, and point-in-time backups (snapshots) are asynchronously uploaded to AWS.
  • Example: A financial firm requires millisecond latency for their local database but wants to meet compliance by having off-site backups in AWS.
• AWS Transfer Family: A fully managed service that enables the transfer of files directly into and out of Amazon S3 or Amazon EFS using SFTP, FTPS, or FTP.
  • Example: A company allows its external partners to upload invoices via SFTP, which are then automatically processed by a Lambda function triggered by the S3 upload.

Worked Examples

Example 1: Selecting a Migration Tool

Scenario: A healthcare company needs to move 100 TB of imaging data from an on-premises NAS to Amazon S3. They have a 1 Gbps Direct Connect link and need the transfer to be encrypted and verified for integrity.

Solution:

1. Service: AWS DataSync.
2. Reasoning: DataSync is designed for large-scale network transfers. It handles encryption in transit, performs automatic data integrity verification, and can saturate the 1 Gbps link more efficiently than manual scripts or standard S3 CLI uploads.
3. Step: Deploy a DataSync agent on-premises $\rightarrow$ Connect to NAS $\rightarrow Set S3 as the destination \rightarrow$ Run the Task.

Example 2: Legacy Backup Modernization

Scenario: A university uses an older backup software that writes to physical LTO-7 tapes. They want to stop managing physical hardware but cannot change the backup software.

Solution:

1. Service: AWS Tape Gateway.
2. Reasoning: It presents an iSCSI-based Virtual Tape Library (VTL) to the existing software. The software "sees" a tape drive, but the data is actually stored in S3 (active tapes) and archived to S3 Glacier (archived tapes).

Checkpoint Questions

1. Which Storage Gateway type should be used if you need to provide low-latency access to files stored in Amazon S3 for an on-premises Windows application using the SMB protocol?
2. What is the main difference between Volume Gateway (Stored) and Volume Gateway (Cached) regarding where the primary data resides?
3. True or False: AWS DataSync is the best choice for providing real-time, persistent file access to on-premises users.
4. Which AWS service would you use to allow external vendors to upload files to your S3 bucket using only the SFTP protocol without managing any servers?

▶Click to see Answers

1. Amazon S3 File Gateway (or FSx File Gateway if Windows-native features like NTFS ACLs are strictly required).
2. In Stored Volumes, the primary data is on-premises. In Cached Volumes, the primary data is in Amazon S3.
3. False. DataSync is for migration and sync; Storage Gateway is for persistent hybrid access.
4. AWS Transfer Family (specifically AWS Transfer for SFTP).