PAS-C01 NFSv3 vs NFSv4.1 locking Practice Question
An SAP system on AWS uses a shared file system for the SAP transport directory. The file system is hosted on an Amazon EFS file system. Recently, the operations team noticed that SAP transports are failing with errors indicating file locking issues. The EFS file system is mounted using the NFS client with default options. What is the most likely cause of the file locking issues?
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
✓
The EFS file system is mounted using NFS version 3, which has limited locking support.
The default NFS client options typically use NFSv3, which has limited file locking support. SAP transport processes rely on robust file locking to coordinate access to the shared transport directory. NFSv4.1, which EFS recommends, provides proper locking with NFSv4.1 state management and lease-based locking. Option A is incorrect because insufficient throughput would manifest as performance degradation or timeouts, not file locking failures. Option B is incorrect because a security group blocking inbound traffic on port 2049 (NFS) would cause mount failures or accessibility issues, not specifically locking errors. Option C is incorrect because EFS access points do not affect locking; they manage file system paths and permissions, and restrictions would cause permission errors.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
The EFS file system has insufficient throughput for the number of concurrent mounts.
Why it's wrong here
Incorrect. EFS access points define file system paths and permissions but do not impact file locking behavior.
- ✗
The security group for the EFS mount targets does not allow inbound traffic on port 2049.
Why it's wrong here
Incorrect. Security group rules blocking port 2049 would prevent NFS mounts or cause general connectivity failures, not specifically locking errors.
- ✗
The EFS file system is using access points that restrict permissions.
Why it's wrong here
Incorrect. Insufficient throughput would cause performance issues or timeouts, not file locking errors.
- ✓
The EFS file system is mounted using NFS version 3, which has limited locking support.
Why this is correct
Correct. Default NFS client options often use NFSv3, which has limited locking support. EFS recommends NFSv4.1 for proper file locking, and using NFSv3 can lead to locking failures observed by the operations team.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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