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What DR strategy could be used to achieve this RTO and RPO in the event of this kind of failure?

An ERP application is deployed across multiple AZs in a single region. In the event of failure, the Recovery Time
Objective (RTO) must be less than 3 hours, and the Recovery Point Objective (RPO) must be 15 minutes the
customer realizes that data corruption occurred roughly 1.5 hours ago.
What DR strategy could be used to achieve this RTO and RPO in the event of this kind of failure?

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A.
Take hourly DB backups to S3, with transaction logs stored in S3 every 5 minutes.

B.
Use synchronous database master-slave replication between two availability zones.

C.
Take hourly DB backups to EC2 Instance store volumes with transaction logs stored In S3 every 5 minutes.

D.
Take 15 minute DB backups stored In Glacier with transaction logs stored in S3 every 5 minutes.

25 Comments on “What DR strategy could be used to achieve this RTO and RPO in the event of this kind of failure?

  1. fun4two says:

    answer is a
    Glacier takes too long to restore
    Replication won’t let you go back in time
    Instance store is ephermal




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    1. mutiger91 says:

      Interestingly the question says, “in this type of failure” which is a data corruption failure. So if we take the question strictly as written, C is a perfectly valid solution. They didn’t ask about instance failures. However, in the real world there are more failure scenarios to consider and you end up with A. It’s really crappy of them if they ask a question like this because for their specific use case, C would be better, but who would do that for an overall backup strategy?




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  2. Kamran says:

    Hmmm, these are mostly all Associate level. I have taken the exam before and found these questions in associate solutions architect.




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    1. Anthony says:

      What if there was a failure after 45 minutes at which time the next backup has not been done? How can you recover the data used 15 mins ago? Remember RPO is 15mins. So I’ll go with B




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