Unmount and Detach
You can use the
umount command (note the spelling of the
umount command) to unmount your device from its mount point (here
$ sudo umount /pvol
You can use the Nectar dashboard to detach a Volume from an instance. Navigate to the Volumes page, and use the action menu for the particular Volume to show the
Manage Attachments dialog. (Alternatively you can use the action menu of the instance on the Compute / Instances page)
Detach then Delete!
Volumes must be detached before deletion.