RTO and RPO

[Sachin44]

Set 2 -> 63. QUESTION

Category: CSAP – Continuous Improvement for Existing Solutions

An online stock trading application is deployed to multiple Availability Zones in the us-east-1 region (N. Virginia) and uses RDS to host the database. Considering the massive financial transactions that the trading application handles, the company has hired you to be a consultant to make sure that the system is scalable, highly-available, and disaster resilient. In the event of failure, the Recovery Time Objective (RTO) must be less than 2 hours and the Recovery Point Objective (RPO) must be 10 minutes to meet the compliance requirements set by the regulators.

In this scenario, which Disaster Recovery strategy can be used to achieve the RTO and RPO requirements in the event of system failure?

Correct answer is – Take hourly database backups and export to an S3 bucket with transaction logs stored in S3 every 5 minutes. Set up a Cross-Region Replication (CRR) to another AWS Region.

Now this seems to be ok from RPO stand point, but how can this serve the RTO of 2 hours considering there is no mention of “server (AMI) backups” or “cloud formation templates” or “scaled down version of application” already existing in other region?

[Kenneth-Samonte-Tutorials-Dojo]

Hi Sachin22,

Thank you for your feedback.

The particular question is focused on the RDS recovery strategy into another region in case the primary region fails. That’s why the choices only mention particular solutions for this requirement.

There is no mention of EC2 instances or AMI backups since there could be other services that may be hosting the application – like ECS Fargate for example.

We do have other questions/scenarios in our practice test that have scaled down versions of application – pilot light or warm-standby or using CloudFormation templates.

Hope this helps.

Let us know if you need further assistance. The Tutorials Dojo team is dedicated to helping you pass your AWS exam!

Regards,

Kenneth Samonte @ Tutorials Dojo