A company needs AWS-based disaster recovery for hundreds of Windows servers that all mount a shared file share. Requirements: RTO 15 minutes, RPO 5 minutes, support native failover and fallback, and be as cost-effective as possible. Which solution best meets these requirements?
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Correct answer: Use AWS Elastic Disaster Recovery to replicate the on-premises servers. Use AWS DataSync to replicate the common share into an Amazon FSx for Windows File Server file system and mount that FSx file system to AWS servers. During a disaster, fail over the on-premises servers to AWS. Fail back to new or existing servers by using Elastic Disaster Recovery..
Why this is the answer
The correct solution leverages AWS Elastic Disaster Recovery (DRS) for server replication and AWS DataSync with Amazon FSx for Windows File Server for the shared file share. DRS provides continuous block-level replication, enabling RPO in seconds and RTO in minutes, meeting the strict requirements. It also supports native failover and fallback. DataSync efficiently replicates file data to FSx for Windows File Server, which is a fully managed, highly available file system compatible with Windows servers, ensuring the shared file share is available in AWS. Other options are less suitable: daily backups to S3 won't meet the RPO/RTO. CloudFormation with EFS and DataSync is a viable option for some DR scenarios, but EFS is not native Windows file share compatible and may not be the most cost-effective for hundreds of Windows servers. An active-active environment with S3 sync is expensive and aws s3 sync is not a robust DR solution for shared file systems.
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