Q4 — AWS SAA-C03 Ch.15

Question 4 of 100 | ← Chapter 15

Q1104. A company runs a critical three-tier web application that consists of multiple virtual machines (VMs) and virtual databases in an on-premises environment. The company wants to set up a disaster recovery (DR) environment in AWS.The company requires a 15-minute recovery time objective (RT0). The company must be able to test the failover solution to validate the recovery. The solution must provide an automated failover mechanism.Which solution will meet these requirements?

Correct Answer: D. Use AWS Elastic Disaster Recovery to replicate the VMs incrementally to AWS. Configure Elastic Disaster Recovery to automate the DR process.

Explanation

To address the company's requirements for a disaster recovery (DR) environment in AWS with a 15-minute recovery time objective (RTO), an automated failover mechanism, and the ability to test the failover solution, let's evaluate each option provided:A. Use AWS Backup to create backups of the on-premises VMs and to restore the backups in AWS. Configure recovery to Amazon EC2 instances to meet the RTO requirement.AWS Backup is primarily for backup and restore operations and does not inherently support continuous or incremental replication, which is crucial for achieving a 15-minute RTO. Restoring from backups typically involves significant downtime and might not meet the strict RTO requirement. B. Use AWS Database Migration Service (AWS DMS) to replicate the on-premises databases to Amazon RDS. Set up AWS Storage Gateway for baseline and incremental data replication to AWS to meet the RTO requirement.AWS DMS is effective for database migration and replication. However, AWS Storage Gateway, primarily used for hybrid cloud storage, might not provide the timely incremental replication required for a 15-minute RTO when dealing with the entire application stack (VMs and databases). C. Use AWS DataSync and AWS Storage Gateway to migrate the baseline and incremental data to AWS. Use Amazon EC2, Amazon S3, and an Application Load Balancer to set up the DR environment.AWS DataSync is designed for high-speed data transfer but isn't specifically tailored for continuous or automated failover of VMs. AWS Storage Gateway, as mentioned before, may not meet the strict RTO requirement for the entire application stack.D. Use AWS Elastic Disaster Recovery to replicate the VMs incrementally to AWS. Configure Elastic Disaster Recovery to automate the DR process.AWS Elastic Disaster Recovery (EDR) is specifically designed for disaster recovery of virtualized environments. It supports incremental replication of VMs, ensuring that the DR environment is up-to-date. Additionally, it can automate the failover process, aligning perfectly with the requirement for an automated failover mechanism. EDR also allows for testing failover scenarios without impacting the production environment, fulfilling the need for validation.Given these considerations, the solution that best meets the company's requirements is:D. Use AWS Elastic Disaster Recovery to replicate the VMs incrementally to AWS. Configure Elastic Disaster Recovery to automate the DR process.This option ensures that the company can achieve a 15-minute RTO, provides an automated failover mechanism, and allows for testing of the failover solution.