This EX200 practice question tests your understanding of configure local storage. 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.
A system administrator needs to create a point-in-time backup of a logical volume 'lv_home' that is currently mounted. Which LVM feature should be used?
lvreduce
Why wrong: Incorrect. lvreduce reduces the size of an LV, not create a backup.
lvchange
Why wrong: Incorrect. lvchange modifies LV attributes, not create snapshots.
lvextend
Why wrong: Incorrect. lvextend increases LV size.
lvcreate -s
Correct. lvcreate with -s creates a snapshot of the LV.
pvmove
Why wrong: Incorrect. pvmove relocates physical extents.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
lvcreate -s
Option D is correct because the 'lvcreate -s' command creates a snapshot of a logical volume, which provides a point-in-time backup without unmounting the volume. Snapshots are a native LVM feature that allow consistent backups of mounted filesystems by capturing the state of the logical volume at the moment the snapshot is created.
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.
lvreduce
Why it's wrong here
Incorrect. lvreduce reduces the size of an LV, not create a backup.
lvchange
Why it's wrong here
Incorrect. lvchange modifies LV attributes, not create snapshots.
lvextend
Why it's wrong here
Incorrect. lvextend increases LV size.
lvcreate -s
Why this is correct
Correct. lvcreate with -s creates a snapshot of the LV.
Related concept
Read the scenario before looking for a memorised answer.
pvmove
Why it's wrong here
Incorrect. pvmove relocates physical extents.
Common exam traps
The trap here is that candidates may confuse 'lvcreate -s' with other LVM commands like 'lvreduce' or 'lvextend', mistakenly thinking those can create backups, or they may assume that a mounted volume must be unmounted before any backup operation, which is not required with LVM snapshots.
Detailed technical explanation
LVM snapshots use a copy-on-write (CoW) mechanism: when data on the original logical volume is modified after the snapshot is created, the original data is copied to the snapshot before the write occurs, preserving the point-in-time state. This allows the snapshot to remain consistent even while the filesystem is actively being written to, making it ideal for backing up mounted volumes like lv_home. In real-world scenarios, snapshots are often used to create consistent backups of databases or critical user data without downtime.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
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FAQ
Configure local storage — This question tests Configure local storage — Read the scenario before looking for a memorised answer..
The correct answer is: lvcreate -s — Option D is correct because the 'lvcreate -s' command creates a snapshot of a logical volume, which provides a point-in-time backup without unmounting the volume. Snapshots are a native LVM feature that allow consistent backups of mounted filesystems by capturing the state of the logical volume at the moment the snapshot is created.
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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