This LFCS practice question tests your understanding of storage management. 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.
After creating an XFS filesystem on /dev/sdb1, an admin mounts it and writes data. Later, they run 'xfs_info /mnt/data' and see the filesystem was created with default settings. What is the default inode size for XFS on a typical Linux system?
512 bytes
Why wrong: Not the default for XFS.
128 bytes
Why wrong: XFS default inode size is 256, not 128.
4096 bytes
Why wrong: That's the block size default for many filesystems.
256 bytes
XFS uses 256-byte inodes by default.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
256 bytes
The default inode size for XFS on a typical Linux system is 256 bytes. This is set at filesystem creation time and provides a balance between supporting extended attributes (like ACLs and SELinux contexts) and minimizing metadata overhead. The `xfs_info` command confirms the default settings, which include this 256-byte inode size.
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.
512 bytes
Why it's wrong here
Not the default for XFS.
128 bytes
Why it's wrong here
XFS default inode size is 256, not 128.
4096 bytes
Why it's wrong here
That's the block size default for many filesystems.
256 bytes
Why this is correct
XFS uses 256-byte inodes by default.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
The trap here is that candidates often confuse the default inode size of XFS (256 bytes) with that of ext4 (128 bytes) or mistake the block size (4096 bytes) for the inode size, leading them to select option B or C.
Detailed technical explanation
XFS inodes are dynamically allocated from the filesystem's inode B-tree and are 256 bytes by default, which includes space for standard metadata (timestamps, ownership, etc.) and up to 96 bytes for inline extended attributes. If extended attributes exceed this space, they are stored in separate blocks, impacting performance. In real-world scenarios, workloads with heavy SELinux or ACL usage may benefit from a larger inode size (e.g., 512 bytes) set at mkfs.xfs time, but this cannot be changed after creation without reformatting.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A security administrator must allow nursing staff to reach a patient records server while blocking access from the guest Wi-Fi VLAN. After applying an extended ACL, traffic is still blocked from nursing workstations. The ACL was applied outbound instead of inbound on the wrong interface. Questions like this test ACL direction and placement rules.
What to study next
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FAQ
Storage Management — This question tests Storage Management — Read the scenario before looking for a memorised answer..
The correct answer is: 256 bytes — The default inode size for XFS on a typical Linux system is 256 bytes. This is set at filesystem creation time and provides a balance between supporting extended attributes (like ACLs and SELinux contexts) and minimizing metadata overhead. The `xfs_info` command confirms the default settings, which include this 256-byte inode size.
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 25, 2026
This LFCS practice question is part of Courseiva's free Linux Foundation certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the LFCS exam.
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