LFCS Storage Management Practice Question
Network Topology
The administrator wants to create a new logical volume of 5GB for /var/log. Which of the following is the most appropriate first step?
⚠ Common exam trap
Many candidates assume lvcreate can always create a new logical volume in an existing volume group, forgetting that the VG must have sufficient free space; they overlook the prerequisite of adding a new PV when the VG is full.
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
✓
Add a new disk (e.g., /dev/sdc) to the system, create a PV, and extend vg_root.
The volume group vg_root currently has no free space to create a new logical volume. Adding a new disk, creating a physical volume (PV) on it, and extending vg_root with vgextend provides the necessary free extents. Only then can lvcreate be used to create the 5GB lv_var_log logical volume for /var/log.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Use lvresize to shrink lv_root by 5G and then create lv_var_log
Why it's wrong here
Shrinking root LV is risky and not straightforward.
- ✓
Add a new disk (e.g., /dev/sdc) to the system, create a PV, and extend vg_root.
Why this is correct
This provides free space to create the new LV.
- ✗
Mount a new filesystem directly on a new partition /dev/sdc1
Why it's wrong here
No new disk is mentioned; also not using LVM.
- ✗
Use lvcreate -L 5G vg_root -n lv_var_log
Why it's wrong here
vg_root has no free space.
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