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XK0-006 Practice Question: Extend the size of a logical volume named…
An administrator needs to extend the size of a logical volume named 'lv_data' in volume group 'vg_data' by 10 GB. A new disk /dev/sdb has been added to the system. What is the correct sequence of commands?
⚠ Common exam trap
Many candidates assume lvextend can be run first because they think the volume group already has space, but the question explicitly states a new disk must be added, so the correct order requires preparing the disk and volume group before extending the logical volume.
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
✓
pvcreate /dev/sdb; vgextend vg_data /dev/sdb; lvextend -L +10G /dev/vg_data/lv_data
It follows the proper sequence for extending a logical volume when a new disk is added: first, initialize the new disk as a physical volume with pvcreate; second, add the physical volume to the volume group with vgextend; third, extend the logical volume by the desired size with lvextend. This order ensures the volume group has available physical extents before attempting to allocate them to the logical volume.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
pvcreate /dev/sdb; vgextend vg_data /dev/sdb; lvextend -L +10G /dev/vg_data/lv_data
Why this is correct
This sequence correctly initializes the physical volume, extends the volume group, then extends the logical volume.
- ✗
lvextend -L +10G /dev/vg_data/lv_data; vgextend vg_data /dev/sdb; pvcreate /dev/sdb
Why it's wrong here
The logical volume cannot be extended without first adding space to the volume group.
- ✗
vgextend vg_data /dev/sdb; pvcreate /dev/sdb; lvextend -L +10G /dev/vg_data/lv_data
Why it's wrong here
pvcreate must be done before vgextend.
- ✗
pvcreate /dev/sdb; lvextend -L +10G /dev/vg_data/lv_data; vgextend vg_data /dev/sdb
Why it's wrong here
vgextend must be done before lvextend.
Go deeper
Related to this question
Learn chapter
User and Group Administration
Key term
Physical volume
A physical volume is a storage device or partition that is initialized for use by a volume manager, allowing it to be combined into logical storage pools.
Key term
Volume group
A volume group is a pool of storage capacity created by grouping one or more physical volumes in Linux LVM that can be carved into logical volumes.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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