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Exam AWS Certified SysOps Administrator - Associate topic 1 question 271 discussion

A SysOps administrator needs to design a disaster recovery (DR) plan for an application on AWS. The application runs on Amazon EC2 instances behind an Application Load Balancer (ALB). The instances are in an Auto Scaling group. The application uses an Amazon Aurora PostgreSQL database. The recovery time objective (RTO) and recovery point objective (RPO) are 15 minutes each.

Which combination of steps should the SysOps administrator take to meet these requirements MOST cost-effectively? (Choose two.)

  • A. Configure Aurora backups to be exported to the DR Region.
  • B. Configure the Aurora cluster to replicate data to the DR Region by using the Aurora global database option.
  • C. Configure the DR Region with an ALB and an Auto Scaling group. Use the same configuration as in the primary Region.
  • D. Configure the DR Region with an ALB and an Auto Scaling group. Set the Auto Scaling group's minimum capacity, maximum capacity, and desired capacity to 1.
  • E. Manually launch a new ALB and a new Auto Scaling group by using AWS CloudFormation during a failover activity.
Show Suggested Answer Hide Answer
Suggested Answer: BD ūüó≥ÔłŹ

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imvb88
Highly Voted 1 year ago
Selected Answer: BD
A vs B: Backups run in intervals -> will lose data up to the last backup point -> cannot achieve low RPO. B is better solution C vs D: D works because the ASG maintains capacity to 1, that means resource are always at least available for failover. C is more costly. E: when you see manual, you run
upvoted 9 times
AgboolaKun
3 months, 2 weeks ago
I disagree with your comment about C being costly. We don't know what the configuration in the primary region is. If the auto scaling group in the primary region sets the maximum EC2 capacity to a value greater than one and the scaling out was in effect when the connection cuts to the DR region, the performance of the application will drop. The application may even crash. Regarding the option C, if auto scaling group configuration is the same as the primary region, it will not necessarily scale out the DR region when it is idle, hence no significant cost incurred. Therefore, I will say BC are a better combination here.
upvoted 1 times
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Gomer
Highly Voted 1 year, 1 month ago
Selected Answer: BC
Global Aurora creates a read only copy in another region that can be manually promoted to R/W for failover, In regards to the scaling group, I'd have to say that having on VM running in al DR region(s) with minimum capacity of 1, but maximum capacity that matches prod means the scaling and load balancing will automatically grow without intervention as soon as Route 53 record points to the failover region. This should not cost 1 cent more to do this, and it eliminates an extra manual step during failover. I can't find documentation to back this up, but I'm sure it's the right answer because it makes sense and simplifies/automates a critical step.
upvoted 7 times
TwinSpark
8 months ago
About c, the issue Is that in the question Is not specify the minimum capacity of production. Still in doubt...
upvoted 1 times
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tsangckl
Most Recent 2 weeks, 1 day ago
Selected Answer: BC
Option B is selected because Aurora Global Databases provide cross-region replication with typically less than 1 second of replication lag, which supports the 15-minute RPO requirement1. This option also allows for quick promotion of the secondary region in case of a disaster, aligning with the 15-minute RTO2. Option C is chosen because having an ALB and an Auto Scaling group pre-configured in the DR region ensures that the application can be quickly redirected and scaled in case of a disaster, meeting the 15-minute RTO2. This setup avoids the time and potential errors associated with manual creation during a failover.
upvoted 1 times
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tgv
1 month, 4 weeks ago
Selected Answer: BD
I tend to choose BD because is a much cost-effective choice than to keep the same configuration in the DR region. I also believe that 15 minutes are enough to scale that ASG from one to the desired value so the app can failover within that period of time. Why not C? Because essentially keeping the same configuration of an application in another region implies huse costs (multi-site approach). Please have a look over these DR strategies and see for yourselves the difference between the Warm Standby and the Active/Active approach. Given the requirement of 15 minutes, I'd say a Warm Standby in this case would be enough.
upvoted 2 times
nakahashi
1 month, 1 week ago
I agree with you
upvoted 1 times
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tgv
1 month, 4 weeks ago
https://docs.aws.amazon.com/whitepapers/latest/disaster-recovery-workloads-on-aws/disaster-recovery-options-in-the-cloud.html
upvoted 1 times
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Bhrino
10 months ago
specifically for C vs D yall it ask for the most cost effective way. if they have the same configuration it will 2x their cost vs just having the min, max, and desired instanced to 1. Because it even has a back up instance means there is fail over. Which is why D is better than C
upvoted 2 times
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Christina666
10 months, 3 weeks ago
Selected Answer: BD
B. Configure the Aurora cluster to replicate data to the DR Region by using the Aurora global database option. Aurora global database allows you to replicate your Aurora database across AWS Regions with minimal replication lag. By setting up the Aurora global database option, you ensure that data is continuously being replicated to the DR Region, which helps meet the Recovery Point Objective (RPO) of 15 minutes. D. Configure the DR Region with an ALB and an Auto Scaling group. Set the Auto Scaling group's minimum capacity, maximum capacity, and desired capacity to 1. By configuring the DR Region with an ALB and an Auto Scaling group with minimum, maximum, and desired capacity set to 1, you ensure that the infrastructure is in place and ready to receive traffic in case of a failover event. Running just one instance will help reduce costs in the DR Region during normal operations while meeting the Recovery Time Objective (RTO) of 15 minutes.
upvoted 5 times
konieczny69
6 months ago
after failover the application will crash due to insufficient resources B and C is the right choice
upvoted 1 times
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mracni
1 year ago
Selected Answer: AD
A D MOST cost-effectively?
upvoted 2 times
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