LFCS Certification Storage Management with LVM 2

Question 1

Which command reduces the size of a logical volume named /dev/vg0/lv_data to 10G?

Accepted Answer

lvreduce -L 10G /dev/vg0/lv_data

Answer

lvreduce is the dedicated command for shrinking a logical volume, accepting an absolute size with -L.

Question 2

Before shrinking an ext4 filesystem on a logical volume, which step is mandatory?

Accepted Answer

Unmount the filesystem, then run resize2fs to shrink it first

Answer

The filesystem must be unmounted and resized with resize2fs before the logical volume itself is reduced to avoid data corruption.

Question 3

What does the command 'vgextend vg0 /dev/sdc' accomplish?

Accepted Answer

Adds physical volume /dev/sdc to the volume group vg0

Answer

vgextend adds an already-initialized physical volume to an existing volume group, increasing available space.

Question 4

Which LVM metadata backup file location stores automatic backups of volume group metadata?

Accepted Answer

/etc/lvm/backup/

Answer

/etc/lvm/backup/ holds the most recent automatic metadata backup for each volume group.

Question 5

A physical volume /dev/sdb is part of vg0 but has no extents allocated. Which command safely removes it from the VG?

Accepted Answer

vgreduce vg0 /dev/sdb

Answer

vgreduce removes a physical volume from a volume group; pvremove then wipes the PV label entirely.

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