LFCS Storage Management with LVM Questions and Answers

Question 1

A system administrator needs to create a new 10GB logical volume named `data_lv` within the `storage_vg` volume group. Which of the following commands correctly accomplishes this task?

Accepted Answer

lvcreate -L 10G -n data_lv storage_vg

Answer

vgcreate -L 10G -n data_lv storage_vg

Answer

pvcreate --size 10G --name data_lv storage_vg

Answer

lvextend -L 10G -n data_lv storage_vg

Question 2

You are managing a server with LVM and need to add a new physical disk, `/dev/sdd`, to an existing volume group named `data_vg`. Which sequence of commands is the correct way to achieve this?

Accepted Answer

pvcreate /dev/sdd; vgextend data_vg /dev/sdd

Answer

vgextend data_vg /dev/sdd; pvcreate /dev/sdd

Answer

lvcreate /dev/sdd; vgextend data_vg /dev/sdd

Answer

pvcreate /dev/sdd; lvextend data_vg /dev/sdd

Question 3

A logical volume `web_lv` in volume group `web_vg` is running out of space. The volume group has 20GB of free space. You need to add 5GB to the logical volume and resize the underlying ext4 filesystem simultaneously. Which command should you use?

Accepted Answer

lvextend -L +5G --resizefs /dev/web_vg/web_lv

Answer

lvextend -L +5G /dev/web_vg/web_lv && resize2fs /dev/web_vg/web_lv

Answer

lvresize -L 5G --resizefs /dev/web_vg/web_lv

Answer

vgextend -L +5G /dev/web_vg/web_lv

Question 4

Which of the following commands provides a verbose, multi-line output detailing the properties of all physical volumes known to the system?

Accepted Answer

pvdisplay

Answer

pvs

Answer

pvscan

Answer

pvreport

Question 5

A system administrator needs to perform a risky software upgrade and wants to create a point-in-time snapshot of the logical volume `/dev/main_vg/app_lv` before proceeding. The snapshot should be named `app_snap` and be allocated 2GB of space for changes. What is the correct command?

Accepted Answer

lvcreate -L 2G -s -n app_snap /dev/main_vg/app_lv

Answer

lvcreate -L 2G -n app_snap /dev/main_vg/app_lv

Answer

lvsnapshot -L 2G --name app_snap /dev/main_vg/app_lv

Answer

vgcreate --snapshot -L 2G -n app_snap /dev/main_vg/app_lv

Question 6

An administrator needs to reduce the size of the logical volume `archive_lv` in the `backup_vg` volume group by 10GB. The logical volume contains an ext4 filesystem that must be shrunk first to avoid data loss. Which command safely accomplishes both the filesystem and logical volume reduction?

Accepted Answer

lvreduce -L -10G --resizefs /dev/backup_vg/archive_lv

Answer

lvreduce -L 10G /dev/backup_vg/archive_lv

Answer

lvextend -L -10G --resizefs /dev/backup_vg/archive_lv

Answer

lvshrink -L 10G --resizefs /dev/backup_vg/archive_lv