sudo dmraid -E -r /dev/sdb.

Do you really want to erase "ddf1" ondisk metadata on /dev/sdb ? [y/n]

ERROR: ddf1: seeking device "/dev/sdb" to 92183432265728 ERROR:
writing metadata to /dev/sdb, offset 180045766144 sectors, size 0
bytes returned 0 ERROR: erasing ondisk metadata on /dev/sdb