Virtual machines (VMs) deployed through Azure Gallery prior to mid February, 2015 do not support Disk Expansion. If you deployed prior to this time period and want to expand the disk, you must re-deploy the VM using the latest VM image available in Azure Gallery.
- Log in to the Microsoft Azure Portal.
- Click Browse, and then click Virtual Machines:
- Click on the Instance where you want to increase storage:
- At the top of the pane, click Settings:
- Click Disks:
- Click Attach New:
Enter the disk size as per your requirement.
Set Host Caching to None:
Once the task is complete, go to Settings of the selected Instance, and then click Restart: