If you need to resize an EC2 instance, or an additional mounted volume in AWS.

To unmount the drive, you may need to comment out the entry for it in /etc/fstab otherwise it’ll be in use when it starts up. Do this, then restart, check it’s not mounted and run sudo e2fsck -f /dev/xvdh then if all clean sudo resize2fs /dev/xvdh you can then check it’s extended with df -h