Quick Answer
The answer is to fail over to the secondary HANA instance, apply OS patches to the primary, then fail back. This minimizes downtime because system replication allows the secondary to take over as active while the primary is patched, keeping the database online and accessible. On the AWS Certified SAP on AWS Specialty PAS-C01 exam, this scenario tests your understanding of SAP HANA system replication as a high-availability mechanism, specifically how to perform OS patching with minimal disruption. A common trap is assuming you can patch the primary directly without a failover, which would require stopping HANA and causing downtime. The key insight is that the secondary is a hot standby, so you leverage it to shift the workload before touching the primary. Memory tip: think "fail over, patch, fail back" like a relay race—hand off the baton before servicing the runner.
This PAS-C01 practice question tests your understanding of operations and maintenance. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
An SAP administrator needs to perform an OS-level patching of the underlying EC2 instances hosting an SAP HANA database in a production environment. The HANA database is configured with system replication across two Availability Zones. What is the best practice to minimize downtime?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "best"
Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
Clue: "minimum / minimize"
Why it matters: Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
Stop the EC2 instance, apply patches, and start.
Why wrong: This causes downtime.
Take a snapshot of the volume, patch the OS, and restore if needed.
Why wrong: This causes downtime.
Fail over to the secondary HANA instance, apply patches to the primary, then fail back.
Minimizes downtime.
Stop the HANA database, apply patches, and restart.
Why wrong: This causes downtime.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Fail over to the secondary HANA instance, apply patches to the primary, then fail back.
Option C is correct because failing over to the secondary and patching the primary reduces downtime. Option A is wrong because stopping HANA causes downtime. Option B is wrong because stopping EC2 instance causes downtime. Option D is wrong because stopping HANA causes downtime.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Stop the EC2 instance, apply patches, and start.
Why it's wrong here
This causes downtime.
Take a snapshot of the volume, patch the OS, and restore if needed.
Why it's wrong here
This causes downtime.
Fail over to the secondary HANA instance, apply patches to the primary, then fail back.
Why this is correct
Minimizes downtime.
Clue confirmation
The clue words "best", "minimum / minimize" in the question point toward this answer.
Related concept
Static NAT maps one inside address to one outside address.
Stop the HANA database, apply patches, and restart.
Why it's wrong here
This causes downtime.
Common exam traps
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Real-world example
An e-commerce site experiences heavy traffic on Black Friday and near-zero traffic during off-peak weeks. Rather than provisioning permanent large VMs, the team uses auto-scaling groups that add capacity automatically under load and reduce it overnight. Questions like this test whether you understand elasticity, availability zones, and cloud compute scaling patterns.
What to study next
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related PAS-C01 NAT questions on configuration and troubleshooting.
Operations and Maintenance — study guide chapter
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FAQ
Operations and Maintenance — This question tests Operations and Maintenance — Static NAT maps one inside address to one outside address..
The correct answer is: Fail over to the secondary HANA instance, apply patches to the primary, then fail back. — Option C is correct because failing over to the secondary and patching the primary reduces downtime. Option A is wrong because stopping HANA causes downtime. Option B is wrong because stopping EC2 instance causes downtime. Option D is wrong because stopping HANA causes downtime.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related PAS-C01 NAT questions on configuration and troubleshooting.
Yes — watch for: "best", "minimum / minimize". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
Static NAT maps one inside address to one outside address.
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Last reviewed: Jun 20, 2026
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