EX200 Configure local storage Practice Question
Which command creates a 2GB logical volume named 'lvdata' in the volume group 'vgdata'?
⚠ Common exam trap
Many candidates confuse the `-L` (size in units) and `-l` (number of extents) flags, leading candidates to incorrectly use `-l` with a size suffix, which is syntactically invalid in LVM2.
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
✓
lvcreate -L 2G -n lvdata vgdata
The `lvcreate` command with `-L 2G` specifies the size in gigabytes, `-n lvdata` sets the logical volume name, and `vgdata` is the volume group in which the logical volume is created. This syntax follows the standard LVM2 command structure for creating a logical volume of a specified size within an existing volume group.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
lvcreate -L 2G -n lvdata vgdata
Why this is correct
This is the correct invocation. The -L 2G option explicitly sets the logical volume's size to 2 gigabytes, -n lvdata assigns the logical volume name, and vgdata is the volume group from which the space is allocated. The syntax matches lvcreate(8): lvcreate [options] volume_group.
- ✗
lvcreate -n vgdata -L 2G lvdata
Why it's wrong here
This command fails because the argument after -n becomes the logical volume name, so it would name the LV 'vgdata', while 'lvdata' is treated as the volume group name. Since no volume group named lvdata exists, lvcreate errors out; conversely, the intended VG 'vgdata' is never specified. The correct order is -n lvdata ... vgdata.
- ✗
lvcreate -n lvdata -s 2G vgdata
Why it's wrong here
Using -s indicates a snapshot creation, not a regular logical volume, and it requires that the following argument (after -L or -l is specified) be an existing logical volume to snapshot. Here -s 2G is syntactically invalid because -s does not take a size; snapshot size must be supplied via -L. Also the final argument vgdata is a volume group, not a source logical volume, so the snapshot source is missing.
- ✗
lvcreate -l 2G -n lvdata vgdata
Why it's wrong here
The -l option specifies logical extents or a percentage of space (e.g., -l 100%FREE), not a raw size like 2G. Passing -l 2G is invalid because the value for -l expects a number of extents or a percent expression, and the unit 'G' is only accepted by -L. To create a 2G logical volume, -L 2G is required.
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