Extending EXT4 LVM
I was able to upgrade the storage in my desktop recently. LVM is something that makes this addition incredibly easy. This post outlines the process I took to double my storage with my new HDD.
Identify Drive
Find the device file we need. In this case it’s /dev/sdc.
dan@ubuntu-test:~$ lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
loop0 7:0 0 219M 1 loop /snap/gnome-3-34-1804/66
loop1 7:1 0 64.8M 1 loop /snap/gtk-common-themes/1514
loop2 7:2 0 55.4M 1 loop /snap/core18/1997
loop3 7:3 0 32.3M 1 loop /snap/snapd/11588
loop4 7:4 0 51M 1 loop /snap/snap-store/518
sda 8:0 0 100G 0 disk
├─sda1 8:1 0 1M 0 part
├─sda2 8:2 0 513M 0 part /boot/efi
└─sda3 8:3 0 99.5G 0 part /
sdb 8:16 0 10G 0 disk
└─backup-pool 253:0 0 10G 0 lvm
sdc 8:32 0 10G 0 disk
Create the PV
dan@ubuntu-test:~$ sudo pvcreate /dev/sdc
Physical volume "/dev/sdc" successfully created.
Add the PV to the VG
To use this new PV we need to know which VG we are trying to extend. Use the command vgs to see the current volume groups on the system.
dan@ubuntu-test:~$ sudo vgs
VG #PV #LV #SN Attr VSize VFree
backup 1 1 0 wz--n- <10.00g 0
Then add it to the VG using vgextend.
dan@ubuntu-test:~$ sudo vgextend backup /dev/sdc
Volume group "backup" successfully extended
Extend the LVM
Now extend the LVM to include the new space.
dan@ubuntu-test:~$ sudo lvextend -l +100%FREE /dev/backup/pool
Size of logical volume backup/pool changed from <10.00 GiB (2559 extents) to 19.99 GiB (5118 extents).
Logical volume backup/pool successfully resized.
Extend the Filesystem
The final step is to allow the filesystem to take more space on the LVM. In this post I am using ext4.
dan@ubuntu-test:~$ sudo resize2fs /dev/backup/pool
resize2fs 1.45.7 (28-Jan-2021)
Resizing the filesystem on /dev/backup/pool to 5240832 (4k) blocks.
The filesystem on /dev/backup/pool is now 5240832 (4k) blocks long.