For each RAID, recovery or reinstating RAID varies. No one size fits all. So if you used Adaptec RAID controllers I'm back to the manual. If it's Intel RAID I'm digging through its manual. If unknown I have to consider sending the drives off to drivesavers.com

It's been accepted installing an OS can endanger all drive content so backup is not optional. Again, you've proven that for others.
Bob