Before extending your volume, login to the customer portal and navigate to the Cloud Platform.
From there, select the region where your instance is located and select the particular instance that you want to resize.
Please make sure that your instance has been stopped before extending the volume
Choose the instance you want to extend it’s volume, select More button and click the Stop button.
Step 1: Click on the Volumes column and find your instance name, select the More button and click on Extend button.
Step 2: Enter the new volume size you wanted and click the resize button.