How to create and extend logical volumes by using LVM on Ubuntu 21.04

Step 8: Create the volume group named “myvg” with PVs contained

root@linuxhelp:~# vgcreate myvg /dev/sdb1 /dev/sdc1
  Volume group "myvg" successfully created

Step 9: List the volume group by using the following command

root@linuxhelp:~# vgs
  VG   #PV #LV #SN Attr   VSize  VFree 
  myvg   2   0   0 wz--n- 24.99g 24.99g

Step 10: Create logical volume named “mylv” with 20GB size in volume group “myvg”

root@linuxhelp:~# lvcreate -L 20G -n mylv myvg
WARNING: ext4 signature detected on /dev/myvg/mylv at offset 1080. Wipe it? [y/n]: y
  Wiping ext4 signature on /dev/myvg/mylv.
  Logical volume "mylv" created.

Step 11: View the volume group with details

root@linuxhelp:~# lvdisplay myvg
  --- Logical volume ---
  LV Path                /dev/myvg/mylv
  LV Name                mylv
  VG Name                myvg
  LV UUID                3s0Afz-7d2Q-Yhcp-rcbO-KozC-2qo0-QadjMr
  LV Write Access        read/write
  LV Creation host, time linuxhelp, 2021-11-13 00:59:16 +0530
  LV Status              available
  open                 0
 LV Size                20.00 GiB
  Current LE             5120
  Segments               2
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:0

Step 12: Format the logical volume “mylv” to ext4 file system

root@linuxhelp:~# mkfs.ext4 /dev/myvg/mylv
mke2fs 1.45.7 (28-Jan-2021)
Creating filesystem with 5242880 4k blocks and 1310720 inodes
Filesystem UUID: f26aa915-2f06-44cf-92fd-8202b05d7408
Superblock backups stored on blocks: 
	32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208, 
	4096000

Allocating group tables: done                            
Writing inode tables: done                            
Creating journal (32768 blocks): done
Writing superblocks and filesystem accounting information: done   

Step 13: Mount the logical volume “mylv” to the directory /mnt

root@linuxhelp:~# mount /dev/myvg/mylv /mnt

Step 14: Viewing the mounted status by using following command

root@linuxhelp:~# df -h
Filesystem             Size  Used Avail Use% Mounted on
tmpfs                  195M  1.6M  194M   1% /run
/dev/sda3               39G  9.7G   27G  27% /
tmpfs                  974M     0  974M   0% /dev/shm
tmpfs                  5.0M  4.0K  5.0M   1% /run/lock
tmpfs                  4.0M     0  4.0M   0% /sys/fs/cgroup
/dev/sda2              512M  5.3M  507M   2% /boot/efi
tmpfs                  195M  116K  195M   1% /run/user/1000
/dev/mapper/myvg-mylv   20G   45M   19G   1% /mnt

Step 15: Open the fdisk to create partions on /dev/sdc disk

root@linuxhelp:~# fdisk /dev/sdd

Welcome to fdisk (util-linux 2.36.1).
Changes will remain in memory only, until you decide to write them.
Be careful before using the write command.

Create New Partition
Command (m for help): n
Partition type
   p   primary (0 primary, 0 extended, 4 free)
   e   extended (container for logical partitions)
Select (default p): 

Using default response p.

Using default partition number and using entire disk space partition by pressing enter for all
Partition number (1-4, default 1): 
First sector (2048-20971519, default 2048): 
Last sector, +/-sectors or +/-size{K,M,G,T,P} (2048-20971519, default 20971519): 

Created a new partition 1 of type 'Linux' and of size 10 GiB.


Change the partition type to Linux LVM 
Command (m for help): t

Selected partition 1
Hex code or alias (type L to list all): 8E
Changed type of partition 'Linux' to 'Linux LVM'.

Save all the  changes made to the disks
Command (m for help): w

The partition table has been altered.
Calling ioctl() to re-read partition table.
Syncing disks.

Step 16: Extend the volume group with “/dev/sdd1” drive

root@linuxhelp:~# vgextend myvg /dev/sdd1
  Physical volume "/dev/sdd1" successfully created.
  Volume group "myvg" successfully extended

Step 17: List the volume group reflected that the 10 GB increased

root@linuxhelp:~# vgs
  VG   #PV #LV #SN Attr   VSize   VFree  
  myvg   3   1   0 wz--n- <34.99g <14.99g

Step 18: Extend the “mylv” logical volume by 10GB

root@linuxhelp:~# lvextend -L +10G /dev/myvg/mylv
  Size of logical volume myvg/mylv changed from 20.00 GiB (5120 extents) to 30.00 GiB (7680 extents).
  Logical volume myvg/mylv successfully resized.

Step 19: Use resize2fs command to change effect on logical volume

root@linuxhelp:~# resize2fs /dev/myvg/mylv
resize2fs 1.45.7 (28-Jan-2021)
Filesystem at /dev/myvg/mylv is mounted on /mnt; on-line resizing required
old_desc_blocks = 3, new_desc_blocks = 4
The filesystem on /dev/myvg/mylv is now 7864320 (4k) blocks long.

Step 20: List the mounted drives to see the changes in memory

root@linuxhelp:~# df -h
Filesystem             Size  Used Avail Use% Mounted on
tmpfs                  195M  1.6M  194M   1% /run
/dev/sda3               39G  9.7G   27G  27% /
tmpfs                  974M     0  974M   0% /dev/shm
tmpfs                  5.0M  4.0K  5.0M   1% /run/lock
tmpfs                  4.0M     0  4.0M   0% /sys/fs/cgroup
/dev/sda2              512M  5.3M  507M   2% /boot/efi
tmpfs                  195M  116K  195M   1% /run/user/1000
/dev/mapper/myvg-mylv   30G   44M   28G   1% /mnt

with this creation of logical volumes by using LVM on Ubuntu 21.04 comes to an end