Hello Mike, What you will need to do is to remove your host connection from the virtual disks first.  Once that has been done then you will want to delete the virtual disks. Then once the virtual disks have been deleted then you can delete the disk group.  Once the disk group has been removed then you can recreate the new disk group and create the virtual disks then assign them to the cluster.   Please let us know if you have any other questions.
Hello, I currently have a MD3220i with two RAID 10 disk groups. I would like to reconfigure these into one big RAID5. These are being used by a Hyper-V Cluster running Server 2012. What would be the proper way of removing the volumes from the cluster, deleting the current disk groups, creating the new disk group, and adding the new volume as a Cluster Shared Volume? I know this is more of a Microsoft question but any guidance is very much appreciated Thanks, Mike.
Reconfigure Existing Disk Groups on MD3220i