** This has not been tested.

        Create a ramdisk of required size
Create 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.

        

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