** This has not been tested. Create a ramdisk of required sizeCreate a Linux software RAID mirror between the ramdisk, and a partition of the same size.
Mark the physical-disk as write-mostly (reads will go to the ramdisk) Format it and load data...On reboot you'll get a RAID1 mirror with 1 failed drive (because the ramdisk is dead of course). Just recreate the ramdisk and resync.