[ovirt-users] Storage domain out of space need help

Running Oracle VM (Ovirt 4.3) on Oracle Linux 7.8. Storage Domain (comprised of local disks in RAID10) is out of space. We have 2 VMs on this physical host. One of them is up (the important one). One of them is down. The VM that is down is a test VM and if there is a way I can delete it from the disk and recover the disk space. I can also purchase more physical disks and add them to the system but then how do I grow the Storage domain if its state is INACTIVE? I also have a second physical server running Linux acting as a NFS server. I would happily add the NFS space to this Storage domain and move the TEST vm to the NFS space. Can some one help explain how I can fix this with out destroying the currently working VM? I have created a backup of the data on the VM but it would be very painful if I had to rebuild it. Thanks,