How to extend the root disk space in Ubuntu
Here’s how to resize the default logical volume in Ubuntu 20.04 (Focal Fossa).
Check the current disk utilization.
dialog@r740:~$ df -h
Filesystem Size Used Avail Use% Mounted on
tmpfs 38G 2.7M 38G 1% /run
/dev/mapper/ubuntu--vg-ubuntu--lv 98G 11G 83G 12% /
tmpfs 189G 0 189G 0% /dev/shm
tmpfs 5.0M 0 5.0M 0% /run/lock
/dev/sda2 2.0G 126M 1.7G 7% /boot
/dev/sda1 1.1G 5.3M 1.1G 1% /boot/efi
tmpfs 38G 4.0K 38G 1% /run/user/1000
The 98G root partition is mounted at /dev/mapper/ubuntu--vg-ubuntu--lv which indicates that it is a logical volume.
View the logical volume
dialog@r740:~$ sudo lvdisplay
--- Logical volume ---
LV Path /dev/ubuntu-vg/ubuntu-lv
LV Name ubuntu-lv
VG Name ubuntu-vg
LV UUID zD6JWq-kNyn-j4QN-B2YQ-PfMk-CQi5-hyGDNW
LV Write Access read/write
LV Creation host, time ubuntu-server, 2022-08-10 17:33:38 +0000
LV Status available
# open 1
LV Size 100.00 GiB
Current LE 25600
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:0
The logical volume belongs to the volume group ubuntu-vg.
The logical volume size is 100 GiB.
View the volume group
dialog@r740:~$ sudo vgdisplay
--- Volume group ---
VG Name ubuntu-vg
System ID
Format lvm2
Metadata Areas 1
Metadata Sequence No 2
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 1
Open LV 1
Max PV 0
Cur PV 1
Act PV 1
VG Size <891.20 GiB
PE Size 4.00 MiB
Total PE 228147
Alloc PE / Size 25600 / 100.00 GiB
Free PE / Size 202547 / <791.20 GiB
VG UUID akPqd3-w8FH-l86R-SQ0Y-42KS-MI7c-Gj2psL
We have 791.2 GiB of free space.
Check the physical volume
dialog@r740:~$ sudo pvdisplay
--- Physical volume ---
PV Name /dev/sda3
VG Name ubuntu-vg
PV Size 891.20 GiB / not usable 2.00 MiB
Allocatable yes
PE Size 4.00 MiB
Total PE 228147
Free PE 202547
Allocated PE 25600
PV UUID HEBVLN-mSCE-lnEB-Ksf5-GSSd-J1m0-pdWPvG
The physical volume size is 891.20 GiB.
Extend the logical volume
We have enough free capacity in the physical volume and the volume group. What is remaining is to extend the logical volume.
dialog@testlab7401:~$ sudo lvextend -l +100%FREE /dev/ubuntu-vg/ubuntu-lv
Size of logical volume ubuntu-vg-1/ubuntu-lv changed from 100.00 GiB (25600 extents) to <891.20 GiB (228147 extents).
Logical volume ubuntu-vg-1/ubuntu-lv successfully resized.
Check the vlume size.
dialog@r740:~$ sudo lvdisplay
--- Logical volume ---
LV Path /dev/ubuntu-vg/ubuntu-lv
LV Name ubuntu-lv
VG Name ubuntu-vg
LV UUID zD6JWq-kNyn-j4QN-B2YQ-PfMk-CQi5-hyGDNW
LV Write Access read/write
LV Creation host, time ubuntu-server, 2022-08-10 17:33:38 +0000
LV Status available
# open 1
LV Size <891.20 GiB
Current LE 228147
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:0
Now, the size has increased to 891.20 GiB.
Resize file system
dialog@r740:~$ sudo resize2fs /dev/mapper/ubuntu--vg-ubuntu--lv
resize2fs 1.46.5 (30-Dec-2021)
Filesystem at /dev/mapper/ubuntu--vg-ubuntu--lv is mounted on /; on-line resizing required
old_desc_blocks = 13, new_desc_blocks = 112
The filesystem on /dev/mapper/ubuntu--vg-ubuntu--lv is now 233622528 (4k) blocks long.
Check the size.
dialog@testlab7401:~$ df -h
Filesystem Size Used Avail Use% Mounted on
tmpfs 38G 2.9M 38G 1% /run
/dev/mapper/ubuntu--vg--1-ubuntu--lv 877G 92G 749G 11% /
tmpfs 189G 0 189G 0% /dev/shm
tmpfs 5.0M 0 5.0M 0% /run/lock
/dev/sda2 2.0G 126M 1.7G 7% /boot
/dev/sda1 1.1G 5.3M 1.1G 1% /boot/efi
tmpfs 38G 4.0K 38G 1% /run/user/1000
Now, the root volume has 877 GiB capacity.