Key Questions for Designing a Disaster Recovery System on AWS
Question
A fintech startup has a successful web product which is built using Node.js on EC2 c4.xlarge instance with an Elastic Load Balancer.
And its database is put into a RDS PostgreSQL m5.4xlarge instance.
All the AWS services are built in AWS region ap-southeast-1
Your manager asked you how to design a disaster recovery system since the product did not have such a system yet.
In order to determine the right services for the DR system, which questions should you ask your manager first? (Select TWO.)
Answers
Explanations
Click on the arrows to vote for the correct answer
A. B. C. D. E.Correct Answer - B, C.
Check the AWS disaster recovery whitepaper is.
https://d1.awsstatic.com/whitepapers/aws-disaster-recovery.pdf.Option A is incorrect: Instance type of EC2 should not be the first thing to consider since it is determined by other factors such as cost.
Option B is CORRECT: Because budget affects how the DR system is designed.
AWS has provided lots of cost-effective services to help achieve the budget target.
Option C is CORRECT: Because for disaster planning, the key concepts are Recovery time objective (RTO) and Recovery point objective (RPO).
Option D is incorrect: Because engine type of RDS normally does not change for a DR system.
Option E is incorrect: Because Elastic Load Balancer type is not an important element that influences how to build a disaster recovery system.
The right questions to ask your manager for designing a disaster recovery system are:
C. What are the RTO and RPO for the product? The Recovery Time Objective (RTO) is the maximum acceptable downtime for the application before it must be restored. The Recovery Point Objective (RPO) is the maximum acceptable data loss. These are important metrics to determine the design of a disaster recovery system. Depending on the RTO and RPO, the system may require an active-active or active-passive setup, and different technologies such as AWS Global Accelerator, Route 53, S3 replication, and Multi-AZ RDS.
B. What is the budget for the disaster recovery system? The budget is also a crucial aspect of designing a disaster recovery system. AWS offers several options, including managed services like AWS Disaster Recovery and backup solutions such as AWS Backup. Each of these options has different costs associated with them, and the budget constraints will impact the design decisions.
A, D, and E are less relevant questions in the context of designing a disaster recovery system. The instance type of EC2, the type of RDS engine, and the type of Elastic Load Balancer are important decisions but are not directly related to disaster recovery. These choices may impact performance, scalability, and reliability, but they do not directly affect the design of a disaster recovery system.
