If you are removing the drives and replacing them then the data would still remain on the removed drives. You would need to retag the old drives exactly as they are in the original VD. After configuring in the controller bios you don't initialize the data upon completion.
Hi there,  I'd like to remove two hard disks connected to a DELL Poweredge T130 built-in RAID controller (mirrored units) and install larger ones. Then install Hyper-V Core edition
Upgrading physical disks in a Poweredge T130