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

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

Answer

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

Answer

lvshrink -L 5G /dev/vg0/lv_data

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

Run fsck only while the filesystem is mounted

Answer

Use lvreduce before any filesystem operation

Answer

Convert the filesystem to XFS before shrinking

Question 3

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

Accepted Answer

/etc/lvm/backup/

Answer

/var/lvm/backup/

Answer

/boot/lvm/

Answer

/lib/lvm/config/

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

A logical volume using 50% of total VG size

Answer

A logical volume using 50 MB

Answer

A logical volume using 50% of used extents

Question 5

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

Accepted Answer

lvdisplay -m /dev/vg0/lv1

Answer

lvshow --segments /dev/vg0/lv1

Answer

lvinfo -s /dev/vg0/lv1

Answer

lvscan --detail /dev/vg0/lv1

Question 6

What is the purpose of the 'vgscan' command?

Accepted Answer

Scans all block devices for LVM volume groups and updates the LVM cache

Answer

Creates a new scan report of VG free space

Answer

Validates VG metadata integrity

Answer

Removes stale VG entries from the system

Question 7

Which option in lvcreate creates a thinly-provisioned logical volume inside a thin pool?

Accepted Answer

--virtualsize

Answer

--thinsize

Answer

--sparse

Answer

--preallocate