RAID 0 + 1 takes four - or more - drives. You only have two. RAID 1 uses two drives or more.
If they were RAID 0 then you would have to connect both drives to an exact or similar RAID controller as they were in the Dell to read the data. If the controller is a separate add-in card - and still works - then you could set them up in another system, connect the drives and recover the data to a third drive. Make sure to connect the drives the same way they were connected before.
If they were RAID 0 then you would have to connect both drives to an exact or similar RAID controller as they were in the Dell to read the data. If the controller is a separate add-in card - and still works - then you could set them up in another system, connect the drives and recover the data to a third drive. Make sure to connect the drives the same way they were connected before.