Trying to create an array:
mdadm --create --verbose /dev/md3 --level=1 --raid-devices=2 --metadata=0.90 /dev/sda /dev/sdb
the command output only:
mdadm: size set to 2930266496K
cat /proc/mdstat gives no information about md3
Personalities : [raid1]
md5 : active raid1 sdf[0] sdg[1]...
