PAS-C01 Technology Practice Question
An SAP system is running on AWS and needs to be migrated from a current generation instance (r3) to a newer generation (r5). What is the recommended process to minimize downtime?
⚠ Common exam trap
Many candidates assume modifying an instance type while running is always possible (Option A), but AWS only supports this for Nitro-based instances with specific configurations (e.g., instances that support 'Modify Instance Type' without stopping). The r3 instances are Xen-based and require a stop to change the instance type to r5 (Nitro-based). Therefore, stopping the instance is necessary.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Stop the instance, change the instance type, and start the instance.
Stopping the instance is required to change the instance type for EC2 instances that are not configured for 'Stop/Start' hibernation or Nitro-based instance compatibility. For SAP systems running on current-generation instances (r3), which are Xen-based, a stop is necessary to modify the instance type to r5 (Nitro-based). This process minimizes downtime by allowing the instance to be stopped, changed, and started in a controlled manner, typically taking only a few minutes.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Modify the instance type while the instance is running.
Why it's wrong here
Instance type cannot be changed while running.
- ✓
Stop the instance, change the instance type, and start the instance.
Why this is correct
Minimal downtime by changing type after stop.
- ✗
Create an AMI of the r3 instance and launch an r5 instance from it.
Why it's wrong here
Unnecessary, can simply change type after stop.
- ✗
Launch a new r5 instance and migrate the SAP system.
Why it's wrong here
More downtime and effort.
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