This LPIC-1 practice question tests your understanding of devices, filesystems and fhs. 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.
An admin needs to create a new filesystem on /dev/sdc1 with a 256-byte inode size and a 1:512 block to inode ratio for a mail server expected to store millions of small files. Which mkfs command best meets these requirements?
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.
mkfs.ext4 -I 256 -i 512 /dev/sdc1
Correctly sets inode size and bytes-per-inode.
mkfs.ext4 -b 4096 -I 256 /dev/sdc1
Why wrong: Sets block size and inode size but not the inode ratio; -i is missing.
mkfs.xfs -i maxpct=50 /dev/sdc1
Why wrong: XFS uses a different allocation strategy and does not have a direct byte-per-inode setting.
mkfs.btrfs -s 4k /dev/sdc1
Why wrong: Btrfs does not support inode size or ratio in this manner.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
mkfs.ext4 -I 256 -i 512 /dev/sdc1
Option A is correct because the `-I 256` flag sets the inode size to 256 bytes, and the `-i 512` flag sets the bytes-per-inode ratio to 512, meaning one inode is created for every 512 bytes of filesystem space. This yields a 1:512 block-to-inode ratio (assuming a 4096-byte block size, each block would have 8 inodes), which is ideal for a mail server storing millions of small files, as it provides a very high inode density to avoid running out of inodes.
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.
mkfs.ext4 -I 256 -i 512 /dev/sdc1
Why this is correct
Correctly sets inode size and bytes-per-inode.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
mkfs.ext4 -b 4096 -I 256 /dev/sdc1
Why it's wrong here
Sets block size and inode size but not the inode ratio; -i is missing.
mkfs.xfs -i maxpct=50 /dev/sdc1
Why it's wrong here
XFS uses a different allocation strategy and does not have a direct byte-per-inode setting.
mkfs.btrfs -s 4k /dev/sdc1
Why it's wrong here
Btrfs does not support inode size or ratio in this manner.
Common exam traps
The trap here is that candidates often confuse the `-I` (inode size) flag with the `-i` (bytes-per-inode) flag, or assume that setting a large block size (`-b 4096`) alone is sufficient to handle many small files, when in fact the inode ratio is the critical parameter for inode count.
Detailed technical explanation
The `-i` (bytes-per-inode) parameter in ext4 directly controls inode density: a lower value creates more inodes, which is critical for filesystems storing many small files (e.g., mail spools). With a 4096-byte block size and `-i 512`, each block can hold up to 8 inodes (4096/512), but note that ext4 limits the minimum bytes-per-inode to 1024 in many implementations, so `-i 512` may be silently rounded up; however, the intent is clear and the option is still the best match. In real-world mail servers, running out of inodes is a common failure mode when using default settings, as millions of small files exhaust the inode table long before disk space is full.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A practitioner preparing for the LPIC-1 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
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FAQ
Devices, Filesystems and FHS — This question tests Devices, Filesystems and FHS — Read the scenario before looking for a memorised answer..
The correct answer is: mkfs.ext4 -I 256 -i 512 /dev/sdc1 — Option A is correct because the `-I 256` flag sets the inode size to 256 bytes, and the `-i 512` flag sets the bytes-per-inode ratio to 512, meaning one inode is created for every 512 bytes of filesystem space. This yields a 1:512 block-to-inode ratio (assuming a 4096-byte block size, each block would have 8 inodes), which is ideal for a mail server storing millions of small files, as it provides a very high inode density to avoid running out of inodes.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Yes — watch for: "best". 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.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 25, 2026
This LPIC-1 practice question is part of Courseiva's free LPI 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 LPIC-1 exam.
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