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210-255 · Question #150
210-255 Question #150: Real Exam Question with Answer & Explanation
The correct answer is C: The journal is the most used part of the disk, making the blocks that form part of it more prone to. The journal in a journaling filesystem is written to with nearly every disk operation, making those blocks the most heavily used and therefore most susceptible to wear-related failure.
Question
Which of the following is true about journaling?
Options
- AThe journal is the least used part of the disk, making the blocks that form part of it more prone to
- BThe journal is the most used part of the disk, making the blocks that form part of it less prone to
- CThe journal is the most used part of the disk, making the blocks that form part of it more prone to
- DThe journal is the least used part of the disk, making the blocks that form part of it less prone to
Explanation
The journal in a journaling filesystem is written to with nearly every disk operation, making those blocks the most heavily used and therefore most susceptible to wear-related failure.
Common mistakes.
- A. The journal is not the least used part of the disk; it is written to continuously for nearly every filesystem operation, and higher usage increases failure risk rather than reducing it.
- B. This choice correctly identifies the journal as the most used area but incorrectly concludes that frequent writes make the blocks less prone to failure; heavy write activity increases wear and raises failure probability.
- D. Both premises are incorrect - the journal is heavily written to (most used), and that high usage increases rather than decreases block failure risk.
Concept tested. Journaling filesystem behavior and disk wear
Reference. https://www.kernel.org/doc/html/latest/filesystems/ext4/journal.html
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