First of all, you should always do a full backup before the changes. The RAID system suppose to be transparent so it shouldn't affect the data or policy on your domain controller.
The first step is to break the mirror of the RAID1. Then you can create the RAID5. Please be aware that RAID5 requires 3 disk drives minimum.
Last Wiki Answer Submitted: November 20, 2007 3:47 pm by HCream1,235 pts.