Now we want to resize the volume to 1000GB, without shutting down our EC2 instance.
Go to your EC2 Management Console, Select your EC2 Instance, scroll down to the EBS Volume, click on it and click the EBS Volume ID, from there select Actions, modify and resize the disk to the needed size. As you can see the disk is now 1000GB:
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
xvda 202:0 0 1000G 0 disk
xvda1 202:1 0 1000G 0 part /