# stop active raid
mdadm --stop /dev/md[01]
# destroy partition table on hdds
dd if=/dev/zero of=/dev/sda bs=1M count=512
dd if=/dev/zero of=/dev/sdb bs=1M count=512
# create new partition table
sgdisk -og /dev/sda
# stop active raid
mdadm --stop /dev/md[01]
# destroy partition table on hdds
dd if=/dev/zero of=/dev/sda bs=1M count=512
dd if=/dev/zero of=/dev/sdb bs=1M count=512
# create new partition table
sgdisk -og /dev/sda