Migration and Hybrid

Building Disaster Recovery with AWS Elastic Disaster Recovery - Continuous Replication and Recovery Testing

Continuously replicate on-premises servers to AWS and validate recovery procedures with recovery drills. Learn the end-to-end workflow through failback.

約 2 分で読めます

Overview of Elastic Disaster Recovery

Elastic Disaster Recovery (DRS) is a service that continuously replicates on-premises or other cloud servers to AWS for rapid recovery during disasters. After installing an agent on the source server, block-level changes are continuously replicated to a staging area in AWS.

Recovery Drills and Failover

A recovery drill is a test that launches EC2 instances from replicated data and verifies application functionality. It can be executed without affecting production replication, and provides actual RTO measurements. Failover follows the same procedure as a drill, launching EC2 instances and switching DNS to direct production traffic to AWS. Failback is the operation of returning data from AWS to the original on-premises environment, with DRS managing the reverse replication.

Network Design and Recovery Automation

DRS replication servers are placed in a staging subnet to receive data from source servers. Instances launched during recovery are placed in a separate subnet (recovery subnet), with production network settings defined in advance. Launch templates configure instance type, security groups, subnets, and IAM roles to minimize manual work during recovery. Post-launch actions automatically execute scripts after instance startup, automating DNS switching and application configuration changes. For understanding DRP design best practices, related books (Amazon) are a helpful reference.

DRS Pricing

DRS pricing consists of EC2 instances and EBS volumes for replication servers. Replication servers run on small instances such as t3.small, costing approximately $15-20 per server per month. Instances launched during recovery drills or failover are billed only for the time they run. EBS snapshot storage costs (approximately $0.05 per GB per month) are incurred based on data volume. Compared to traditional DR solutions (always-on standby environments), costs are significantly reduced.

Summary

Elastic Disaster Recovery is a DR service that reduces RPO to seconds through continuous replication and enables recovery in minutes. Pre-define instance settings for recovery with launch templates and automate DNS switching with post-launch actions. Validate RTO/RPO targets through regular recovery drills, and achieve significant cost savings compared to traditional always-on standby environments.

Related Services

AWS Elastic Disaster RecoveryA service that continuously replicates on-premises or other cloud servers to AWS for disaster recoveryAmazon EC2A compute service that provides virtual servers in the cloudAmazon EBSA block storage service that attaches to EC2 instances

Related Articles

Centralized Backup Management with AWS Backup - Backup Plans and Cross-Region ProtectionManage backups for EC2, RDS, DynamoDB, and more under a unified policy. Covers Vault Lock WORM protection and automated restore testing.Amazon EBS Volume Design and Operations - Selection Criteria for gp3 and io2 with Snapshot StrategiesClarify the selection criteria for gp3 and io2 volume types, and learn practical IOPS/throughput design guidelines along with snapshot-based backup strategies.Amazon EBS Encryption and Snapshot Sharing - Cross-Account and Cross-Region DesignA comprehensive guide covering default encryption setup, cross-account snapshot sharing, and cross-region copy for DR design.

More on This Topic

Data Transfer and Synchronization - Building a Fast and Secure Data Migration Platform with AWS DataSyncLearn how to use AWS DataSync for data transfer and synchronization between on-premises and AWS. This guide covers large-scale data migration with S3 integration and building continuous data synchronization pipelines.Database Migration Service - Safe and Efficient Database Migration with AWS DMSLearn how to use AWS Database Migration Service (DMS) for database migration. This guide covers homogeneous and heterogeneous database migration with RDS integration, and practical methods for minimizing downtime through continuous replication.Accelerating Data Transfer with AWS DataSync - Migration from On-Premises to S3 and EFSAutomate high-speed data transfer from on-premises to S3 and EFS. This guide covers agent deployment, task scheduling, and transfer data integrity verification.Mainframe Migration - Moving Legacy Systems to the Cloud with AWS Mainframe ModernizationLearn about mainframe cloud migration using AWS Mainframe Modernization. This article covers two migration patterns - replatforming (Micro Focus) and refactoring (Blu Age) - along with migration strategies.Migrating Mainframes to AWS with AWS Mainframe Modernization - Replatforming and RefactoringLearn about migration patterns for mainframe applications using Mainframe Modernization, and when to choose Blu Age versus Micro Focus.Accelerating Mainframe Modernization - Modernize Legacy COBOL in Months with AWS TransformLearn about mainframe modernization with AWS Transform for mainframe. This article covers automated COBOL code analysis, Java conversion, and phased migration strategies.Planning and Executing Large-Scale Migrations with AWS MGN - Wave Design and Cutover AutomationPlan migrations of hundreds of servers using wave design, automate cutover with post-launch scripts, and optimize instances after migration.Practical Lift-and-Shift Migration with AWS Application Migration Service (MGN)A practical guide to lift-and-shift migration from agent installation to cutover, covering design considerations and network configuration.

Similar Articles and Services

AWS Elastic Disaster RecoveryA DR service that continuously replicates on-premises and other-cloud servers to AWS, enabling failover in minutesAWS DR Strategy Options - Designing Disaster Recovery Step by Step from Pilot Light to Multi-SiteWe explain the breadth and flexibility of disaster recovery options AWS provides, focusing on Pilot Light, Warm Standby, Multi-Site Active/Active strategies, and Elastic Disaster Recovery.Practical Lift-and-Shift Migration with AWS Application Migration Service (MGN)A practical guide to lift-and-shift migration from agent installation to cutover, covering design considerations and network configuration.Planning and Executing Large-Scale Migrations with AWS MGN - Wave Design and Cutover AutomationPlan migrations of hundreds of servers using wave design, automate cutover with post-launch scripts, and optimize instances after migration.