RHCSA RHCSA LVM Storage Management 5 — Questions and Answers
Question 1: After importing physical disks from another system, which command makes the volume group available on the new system?
- vgactivate
- vgimport vg0
- vgscan && vgactivate
- vgimport vg0 && vgchange -ay vg0 (Correct answer)
Correct answer: vgimport vg0 && vgchange -ay vg0
vgimport re-registers the VG with the system, then vgchange -ay activates it so LVs can be mounted.
Question 2: What is the purpose of the 'vgcfgrestore' command?
- Restores a VG from a full disk backup
- Restores VG metadata from an archived configuration file (Correct answer)
- Rebuilds corrupted filesystem data on all LVs
- Re-creates missing device nodes for LVs
Correct answer: Restores VG metadata from an archived configuration file
vgcfgrestore restores the LVM metadata for a volume group from a backup stored in /etc/lvm/backup/.
Question 3: Which option with 'lvcreate' creates a thin-provisioned pool named 'thin_pool' in vg0?
- lvcreate -T -L 20G -n thin_pool vg0
- lvcreate --thin -L 20G -n thin_pool vg0
- lvcreate -T -L 20G -n thin_pool vg0
- Both A and C are correct (Correct answer)
Correct answer: Both A and C are correct
-T and --thin are equivalent flags for creating a thin pool; both commands produce the same result.
Question 4: A volume group shows 'partial' status. What does this indicate?
- The VG is partially activated
- One or more PVs in the VG are missing or unavailable (Correct answer)
- The VG has less than 50% free space
- The VG has been exported but not imported
Correct answer: One or more PVs in the VG are missing or unavailable
A 'partial' VG means at least one physical volume member is missing, making some LV data inaccessible.
Question 5: Which lvs output column shows the type of a logical volume (e.g., linear, thin, snapshot)?
- LV_TYPE
- Attr (Correct answer)
- Seg_type
- LV_layout
Correct answer: Attr
The 'Attr' column in lvs output encodes LV type and state using a multi-character attribute string.
Question 6: When shrinking an ext4 logical volume, what must be done BEFORE running lvreduce?
- Activate the LV in read-only mode
- Unmount and run resize2fs to shrink the filesystem first (Correct answer)
- Run pvmove to relocate data
- Take a snapshot of the LV
Correct answer: Unmount and run resize2fs to shrink the filesystem first
The filesystem must be shrunk with resize2fs before lvreduce, or data at the end of the LV will be truncated.
Question 7: What is the effect of running 'vgchange -an vg0'?
- Activates all logical volumes in vg0
- Deactivates all logical volumes in vg0 (Correct answer)
- Deletes the vg0 volume group
- Sets vg0 to auto-activation mode
Correct answer: Deactivates all logical volumes in vg0
vgchange -an deactivates all logical volumes in the specified volume group, making their device nodes unavailable.
RHCSA RHCSA LVM Storage Management 5
After importing physical disks from another system, which command makes the volume group available on the new system?