Oracle 1z0-997-22: How would you meet RPO requirement in case of regional failure

Table of Contents

Question
Answer
Explanation
Reference

Question

You are responsible for a web application deployed on a set of compute VM instances in Oracle Cloud Infrastructure (OCI). Your application stores data on block volumes. In production, the business requirement is a Recovery Point Objective (RPO) of two hours and that data should be recoverable in case of a regional failure. How would you meet the RPO requirement in the event of a failure?

A. Create a user-defined storage backup policy and attach a schedule of type “Hourly” and automatically copy to another region. Apply this policy to a volume group containing the block volumes.
B. Store hourly block volume backups to an NVMe device attached to a compute instance in a different Availability Domain (AD).
C. Configure your application to use synchronous primary-secondary data replication between ADs.
D. Set up cross-region volume replication to replicate the block volumes to a different OCI region.

Answer

D. Set up cross-region volume replication to replicate the block volumes to a different OCI region.

Explanation

The correct answer to the question is D. Set up cross-region volume replication to replicate the block volumes to a different OCI region.

Here is a detailed explanation of why this is the correct answer and why the other options are incorrect:

Option A is incorrect because creating a user-defined storage backup policy and attaching a schedule of type “Hourly” and automatically copying to another region does not meet the RPO requirement of two hours. Storage backup policies are used to create point-in-time snapshots of volumes that can be restored later, but they are not guaranteed to start at the exact time specified by the backup schedule. You may see up to several hours of delay between the scheduled start time and the actual start time for the volume backup in scenarios where the system is overloaded. Moreover, copying backups to another region may also take additional time depending on the network bandwidth and the size of the backups. Therefore, this option may not ensure that you have a recent backup of your data in case of a regional failure.
Option B is incorrect because storing hourly block volume backups to an NVMe device attached to a compute instance in a different Availability Domain (AD) does not protect your data in case of a regional failure. NVMe devices are ephemeral storage devices that are attached to compute instances and provide high performance and low latency. However, they are not durable or persistent, and they do not support backups or snapshots. If the compute instance or the NVMe device fails, or if the region becomes unavailable, you will lose your data and backups stored on the NVMe device.
Option C is incorrect because configuring your application to use synchronous primary-secondary data replication between ADs does not protect your data in case of a regional failure. Synchronous replication means that every write operation on the primary volume is replicated to the secondary volume before it is acknowledged to the application. This ensures that the primary and secondary volumes are always consistent and have the same data. However, this option only works within the same region, as it requires low latency and high bandwidth between the ADs. If the region becomes unavailable, you will lose access to both the primary and secondary volumes.
Option D is correct because setting up cross-region volume replication to replicate the block volumes to a different OCI region meets both the RPO and the regional failure recovery requirements. Cross-region volume replication allows you to perform ongoing automatic asynchronous replication of block volumes, boot volumes, and volume groups to other regions. This feature supports disaster recovery scenarios without requiring volume backups and volume group backups. The replication process is continuous, with the typical RPO target rate being less than thirty minutes for replication across regions. The replica volume on the target region is always available and can be activated within a recovery time objective (RTO) of a minute or less. This ensures that you can quickly restore your data and resume your application on another region in case of a regional failure.

Reference

Oracle Cloud Infrastructure 2022 Architect Professional 1z0-997-22 certification exam practice question and answer (Q&A) dump with detail explanation and reference available free, helpful to pass the Oracle Cloud Infrastructure 2022 Architect Professional 1z0-997-22 exam and earn Oracle Cloud Infrastructure 2022 Architect Professional 1z0-997-22 certification.