This page describes how to mount local disk volumes on Virtual Machines in the "SKY" cluster. If you are instead looking to mount GPFS or Archival on your VM, you'll need to submit a support request.
Often times, your VM will come with more than one disk volume. The primary volume is the operating system partition, and is usually 50gb. If you have purchased a "medium" or "large" VM, you will also have a second volume with additional storage space, but you may need to format and mount it before you are able to use it.