Quick Answer
The answer is to disable updating the access time on files, improving performance. The noatime mount option prevents the filesystem from writing a timestamp to the inode every time a file is read, which for SAP HANA on the /hana/data volume eliminates a massive amount of unnecessary metadata writes during high-frequency I/O operations. On the AWS Certified SAP on AWS Specialty PAS-C01 exam, this concept tests your understanding of how to optimize EBS mount options for SAP HANA workloads, often appearing in a scenario where a candidate must choose between relatime, noatime, and the default atime. A common trap is confusing noatime with nodiratime, but remember that noatime implicitly includes nodiratime, making it the stronger performance choice for data volumes. Memory tip: “No atime, no crime against I/O” — think of noatime as removing a timestamp tax on every read.
This PAS-C01 practice question tests your understanding of design of sap workloads on aws. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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.
Refer to the exhibit. # /etc/fstab entry for HANA data volume UUID=abc123 /hana/data xfs defaults,noatime 0 0
An SAP administrator is configuring the /hana/data volume for SAP HANA on an EC2 instance. The exhibit shows the /etc/fstab entry. What is the purpose of the 'noatime' mount option?
Refer to the exhibit. # /etc/fstab entry for HANA data volume UUID=abc123 /hana/data xfs defaults,noatime 0 0
To enable swap space on the volume.
Why wrong: noatime is not for swap.
To enable disk quotas.
Why wrong: noatime is for access time.
To mount the volume as read-only.
Why wrong: Read-only is 'ro'.
To disable updating the access time on files, improving performance.
noatime reduces write operations.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
To disable updating the access time on files, improving performance.
The 'noatime' mount option disables the update of inode access timestamps (atime) on every file read. For SAP HANA, which performs high-frequency I/O operations on the /hana/data volume, this eliminates unnecessary metadata writes, reducing disk I/O overhead and improving overall filesystem performance.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
To enable swap space on the volume.
Why it's wrong here
noatime is not for swap.
To enable disk quotas.
Why it's wrong here
noatime is for access time.
To mount the volume as read-only.
Why it's wrong here
Read-only is 'ro'.
To disable updating the access time on files, improving performance.
Why this is correct
noatime reduces write operations.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
The trap here is that candidates may confuse 'noatime' with other mount options like 'ro' (read-only) or 'sw' (swap), or assume it is related to performance tuning for swap or quotas, when in fact it specifically targets access time updates to reduce I/O overhead.
Detailed technical explanation
Under the hood, the Linux kernel updates the inode's atime field on every read() system call by default. With 'noatime', this update is skipped, which can significantly reduce write I/O on metadata-heavy workloads like SAP HANA. In real-world scenarios, using 'noatime' on database volumes can improve throughput by up to 10-15% in high-read environments, as it eliminates a synchronous metadata write per read operation.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
What to study next
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FAQ
Design of SAP Workloads on AWS — This question tests Design of SAP Workloads on AWS — Read the scenario before looking for a memorised answer..
The correct answer is: To disable updating the access time on files, improving performance. — The 'noatime' mount option disables the update of inode access timestamps (atime) on every file read. For SAP HANA, which performs high-frequency I/O operations on the /hana/data volume, this eliminates unnecessary metadata writes, reducing disk I/O overhead and improving overall filesystem performance.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 24, 2026
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