Storage: Logical Volumes

Question 1

Device mapper

Answer 1

Creates virtual device and passes data from that virtual device to one or more physical devices

Question 2

DM-Multipath

Answer 2

Provides redundancy and improved performance for block storage devices

Question 3

Where do you find the config files for the multipath-tools package?

Answer 3

/etc/multipath.conf

Question 4

mdadm

Answer 4

A tool used to create and manage software-based RAID arrays

Question 5

/proc/mdstat File

Answer 5

Contains a snapshot of the kernel’s RAID/md state

Question 6

How to view the RAID state?

Answer 6

cat /proc/mdstat

Question 7

Logical Volume Manager (LVM)

Answer 7

Maps whole physical devices and partitions into one or more virtual containers called volume groups

Question 8

What does the LVM offer?

Answer 8

● Dynamically create, delete, and resize volumes
● Map logical volumes across physical devices
● Create virtual snapshots of each logical volume

Question 9

/dev/mapper/

Answer 9

contains all of the logical volumes on a system

Question 10

pvscan

Answer 10

Scans for all physical devices being used as physical volumes

Question 11

pvcreate

Answer 11

Initializes a drive or partition to use as a physical volume

Question 12

pvdisplay

Answer 12

Lists attributes of physical volumes

Question 13

pvs

Answer 13

Displays information about physical volumes

Question 14

pvck

Answer 14

Checks the metadata of physical volumes

Question 15

pvremove

Answer 15

Removes physical volumes

Question 16

vgscan

Answer 16

Scans all physical devices for volume group

Question 17

vgdisplay

Answer 17

Lists attribute of volume groups

Question 18

vgs

Answer 18

Displays information about volume groups

Question 19

vgck

Answer 19

Checks the metadata of volume groups

Question 20

vgrename

Answer 20

Renames a volume group

Question 21

vgextend

Answer 21

Adds physical volumes to volume groups

Question 22

vgmerge

Answer 22

Merges two volume groups

Question 23

vgsplit

Answer 23

Splits a volume group into two

Question 24

vgremove

Answer 24

Removes volume groups

Question 25

lvscan

Answer 25

Scans all physical devices for logical volumes

Question 26

lvcreate

Answer 26

Creates logical volumes in a volume group

Question 27

lvdisplay

Answer 27

Lists attributes of logical volumes

Question 28

lvchange

Answer 28

Changes attributes of the volumes

Question 29

lvs

Answer 29

Displays information about logical volumes

Question 30

lvrename

Answer 30

Renames logical volumes

Question 31

lvreduce

Answer 31

Reduces the size of logical volumes

Question 32

lvextend

Answer 32

Extends the size of logical volumes

Question 33

lvresize

Answer 33

Resizes logical volumes

Question 34

lvremove

Answer 34

Removes logical volumes