Resize a disk in Linux

The following example shows the volumes on a Nitro-based instance:

[system-user ~]$ lsblk
NAME    MAJ:MIN RM  SIZE RO TYPE MOUNTPOINT 
sda       8:0    0   30G  0 disk
├─sda1    8:1    0  9.9G  0 part /
├─sda14   8:14   0    4M  0 part
└─sda15   8:15   0  106M  0 part /boot/efi
  • The root volume, /dev/sda, has a partition, /dev/sda1. While the size of the root volume reflects the new size, 30 GB, the size of the partition reflects the original size, 30 GB, and must be extended before you can extend the file system.

To extend the partition on the root volume, use the following growpart command. Notice that there is a space between the device name and the partition number.

[system-user ~]$ sudo growpart /dev/sda 1

You can verify that the partition reflects the increased volume size by using the lsblk command again.

[system-user ~]$ lsblk
NAME    MAJ:MIN RM  SIZE RO TYPE MOUNTPOINT
sda       8:0    0   30G  0 disk 
├─sda1    8:1    0 29.9G  0 part /
├─sda14   8:14   0    4M  0 part 
└─sda15   8:15   0  106M  0 part /boot/efi

Extending the File System

Use a file system-specific command to resize each file system to the new volume capacity. For a file system other than the examples shown here, refer to the documentation for the file system for instructions.

Example: Extend an ext2, ext3, or ext4 file system

Use the df -h command to verify the size of the file system for each volume. In this example, /dev/sda1 reflects the original size of the volume, 10 GB.

[system-user ~]$ df -h
/dev/root       9.6G  3.9G  5.7G  41% /
...

Use the resize2fs command to extend the file system on each volume.

[system-user ~]$ sudo resize2fs /dev/sda1

You can verify that each file system reflects the increased volume size by using the df -h command again.

[system-user ~]$ df -h
/dev/root        29G  3.8G   26G  14% /
...

Hello world!

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  • Ubuntu 18.04 on ZFS
  • LXD containers
  • Linux performance tuning
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  • And other random things