You can increase the disk root size when your VM instance needs additional storage space. You can only resize the root disk to increase its size, you cannot reduce the size of the root disk.
In the Action column, click More, then select Resize Root Disk.
Instance Page
Enter the size of the Root Disk as needed, but the root disk cannot be below 20GB. then click Resize Root Disk to save or cancel if you don't change the root disk size.
Instance Page - Increase Root Disk Size
There will be a process of expanding the size of the root disk.
Instance Page - Process Increase Root Disk
New data that has been saved is automatically updated in the Instance list.
