Linux+ Linux+ Logical Volume Management (LVM) 2

Question 1

Which command reduces the size of a logical volume named /dev/vg0/lv_data by 5GB?

Accepted Answer

lvreduce -L -5G /dev/vg0/lv_data

Answer

lvreduce reduces the size of a logical volume, using -L with a negative value to specify the reduction amount.

Question 2

What must be done before shrinking an ext4 filesystem on a logical volume?

Accepted Answer

Unmount the filesystem and run resize2fs first

Answer

The filesystem must be unmounted and resized with resize2fs before shrinking the logical volume to prevent data corruption.

Question 3

Which LVM metadata backup file location is used by default for vgcfgbackup?

Accepted Answer

/etc/lvm/backup/

Answer

LVM stores volume group configuration backups in /etc/lvm/backup/ by default when vgcfgbackup is run.

Question 4

A volume group has 100 extents free. What does 'lvcreate -l 50%FREE vg0 -n lv_new' create?

Accepted Answer

A logical volume using 50 extents

Answer

The %FREE suffix calculates 50% of the currently free extents (100), creating a volume using 50 extents.

Question 5

Which command displays detailed information about a specific logical volume including its segments?

Accepted Answer

lvdisplay -m /dev/vg0/lv1

Answer

lvdisplay -m (or --maps) shows logical volume segment mapping details including physical extents.

Linux Practice Test