LFCS Storage Management Practice Question
An administrator wants to extend a logical volume named 'lv_data' in volume group 'vg_data' by 5GB. The volume group has free physical extents. Which command should be used?
⚠ Common exam trap
A common mix-up: candidates confuse `lvextend` with `lvresize` or forget the `+` sign in the size specification, leading them to choose Option C or D, or they might incorrectly use `pvextend` (Option A) which does not exist in LVM.
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
✓
lvextend -L +5G /dev/vg_data/lv_data
The correct command to extend a logical volume is `lvextend`. Option B uses the correct syntax with the `-L +5G` flag, which adds 5GB to the existing logical volume `/dev/vg_data/lv_data`. The volume group `vg_data` has free physical extents, so the extension can proceed without needing to add new physical volumes.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
pvextend -L +5G /dev/vg_data/lv_data
Why it's wrong here
pvextend is not a valid LVM command; the correct command to extend a logical volume is lvextend.
- ✓
lvextend -L +5G /dev/vg_data/lv_data
Why this is correct
Correct. lvextend -L +5G adds 5GB to the existing logical volume.
- ✗
lvresize -L +5G /dev/vg_data/lv_data
Why it's wrong here
lvresize is a valid LVM command that can extend or reduce logical volumes, but lvextend is the more specific command for extension. While lvresize -L +5G achieves the same result, the question expects lvextend.
- ✗
lvextend -L 5G /dev/vg_data/lv_data
Why it's wrong here
lvextend -L 5G sets the new size to exactly 5GB instead of adding 5GB. The + prefix is required to add to the existing size.
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