Exam AWS Certified Solutions Architect - Professional SAP-C02 topic 1 question 202 discussion

Bad question design. EC2 is in ASG, which means the application part is stateless, so no need to backup or replicate. Only database need replication.

Explanation: Option B leverages infrastructure as code (IaC) to provision the necessary infrastructure in the DR Region, which allows for automated and repeatable deployments. Creating a cross-Region read replica for the Amazon RDS DB instance ensures that the database is replicated and available in the DR Region. AWS Elastic Disaster Recovery can be used to continuously replicate the EC2 instances from the primary Region to the DR Region, ensuring up-to-date copies of the application. Running the EC2 instances at the minimum capacity in the DR Region helps reduce costs, as resources are only utilized when failover occurs. Using an Amazon Route 53 failover routing policy allows for automatic failover to the DR Region in the event of a disaster, minimizing downtime. Increasing the desired capacity of the Auto Scaling group ensures that sufficient resources are available in the DR Region to handle the workload during failover.

RPO seconds, RTO minutes => warm standby warm standby => always running but smaller always running but smaller => B. Run the EC2 instances at the minimum capacity in the DR Region

Option B most cost effective for RTO=10 min and RPO=30 min.

RPO of 30 seconds can be achieved with Elastic disaster recovery for continuous EC2 instance replication, while DB read replica can be promoted to primary within 30 seconds

Close between B & D but Max out ASG is tie-breaker

I think (D) only aurora global database can meet RPO 30 seconds? although B is cost-effective

B for sure

A) Not seems for my , posible backup B) Active Pasive C) Backup D ) Active Active Then B is correct in this case

olabiba.ai said B.

Do the math, option A is 5.55 days.

A Wrong - I have stopped reading after 'create cron' , Same goes with C. D Wrong - Running ASG at full capacity in the DR is not cost efficient

i think i agree with option B, initially chosen D the problem is that we need a cost effective solution and based on the following the global database might be more expensive and the fact the RDS cross region replication may cover the RTO of 10 minutes. quick compare on global database and cross region replication RDS Cross Region Replication - You will accrue charges for data transfer between Amazon EC2 and Amazon RDS across Regions, charged on both sides of the transfer ($0.02/GB out) Aurora Global Database - you pay for replicated write I/O operations between the primary Region and each secondary Region. The number of replicated write I/O operations to each secondary Region is the same as the number of in-Region write I/O operations performed by the primary Region Replicated Write I/Os $0.20 per million replicated write I/Os

I would go with B as 10minutes RTO allows for scale up the ASG size. Also read replica is cheaper and can be promoted to primary. Also aurora replication to read replica is usually much less than 100 milliseconds after the primary writes operation which will be enough fot the RPO of 30 seconds.

Cost efective = B

Agree with B

save the running EC2 cost. Only bring up when needed