You can increase the storage capacity of your current Linux machine by attaching external storage.
Step 1. Login into your Microsoft Azure account.
Step 2. Open your Virtual Server through which you want to attached additional hard drive.
Step 3. Click on disks option under the settings in the service panel of the page.
Step 4. Now click on attach new option at the top of the page & specify the new disk details as per your requirements.After that click on OK.
Step 5. After clicking on OK, new hard drive will successfully created & attached with your virtual server.You can view your new hard drive under the DATA DISKS.