Upon successful completion, the mrd_startup(3mrd) and mrd_
    shutdown(3mrd) functions return the value MRD_STATUS_SUCCESS.
    If the mrd_startup(3mrd) fails the returned status value will be
    set to one of the following values. Other values that correspond
    to specific SCSI errors may also be possible, but these are the
    most likely.
Additional Information:
explode
extract