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Linux: How to extend LVM volume 2022-05-15

This article describes how to expand an LVM group and volume on a Linux operating system.

Situation 1: new disk

First step: creating a physical volume

After you have attached the disk to a physical server or virtual machine, you need to type command:

sudo fdisk -l

This is to make sure the drive is recognized by the operating system, and to identify the drive name. Output of the command will be something like this:

Disk /dev/vdc: 5 GiB, 5368709120 bytes, 10485760 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes/512 bytes
I/O size (minimum/optimal): 512 bytes/512 bytes

Once you have identified the drive name (in our case it is /dev/vdc), you can create physical volume using the command:

sudo pvcreate /dev/vdc

You will see output like this:

    kostya@ubuntu-21-04:~$ sudo pvcreate /dev/vdc
    Physical volume "/dev/vdc" successfully created.
    kostya@ubuntu-21-04:~$

Step two: extend the volume group

To get a list of available volume groups run this command:

vgdisplay

You can now extend the volume group. This is done by the following command:

sudo vgextend {vg-name} {pv-name}

In our case, it will be:

sudo vgextend vg-example /dev/vdc

You will see output like this:

kostya@ubuntu-21-04:~$ sudo vgextend vg-example /dev/vdc
Physical volume "/dev/vdc" successfully created.
Volume group "vg-example" successfully extended
kostya@ubuntu-21-04:~$

Step three: extending the logical volume

Extending a logical volume can be done with the following command:

sudo lvextend --size + {size} {vg-name/lv-name}

In our case, it will be:

sudo lvextend --size +2G vg-example/lv-example

You will see output like this:

kostya@ubuntu-21-04:~$ sudo lvextend --size +2G vg-example/lv-example
Size of logical volume vg-example/lv-example changed from 5.00 GiB (1280 extents) to 7.00 GiB (1792 extents).
Logical volume vg-example/lv-example successfully resized.
kostya@ubuntu-21-04:~$

If you want the logical volume to use all the free space in the volume group, then type command:

sudo lvextend --extents +100%FREE vg-example/lv-example

Fourth step: extending the file system

If you have xfs file system, then the extending can be done with the following command:

sudo xfs_growfs /dev/{vg-name}/{lv-name}

In our case, it will be:

sudo xfs_growfs /dev/vg-example/lv-example

For ext4 filesystem, replace xfs_growfs with resize2fs

Situation 2: if the size of the existing disk has changed

Sometimes the size of an existing disk can change, for example, in case of a virtual machine. In this case, the first step will be different, the second step will not be performed, and the rest of the steps will be pretty the same as in the situation with a new disc described above. The first step is not to create a physical volume, but to resize the existing one. It can be done with the command:

sudo pvresize /dev/DISKNAME

For example,

sudo pvresize /dev/vdc