Please follow the steps in the Intel® Rapid Storage Technology user guide, pages 29-33.
The drive is brand new. The data was transferred to it a week earlier. Intel could revise their software to add a switch for /keepdata in the event disks without a standard partition table exist. I hobbled together a number of other drives, transferred the data away and created the mirror. It was a time-consuming and stressful process. I appreciate your assistance.