mdadm set the mode before a second device raid1?

ok im found problem. right command :

mdadm /dev/md0 -a /dev/sda1

not :

mdadm –manage /dev/md0 –add /dev/sda1

and finally working on !

root@rescue ~ # cat /proc/mdstat
Personalities : [raid1]
md3 : active raid1 sda5[3] sdb5[2]
      1847605568 blocks super 1.0 [2/1] [_U]
        resync=DELAYED

md2 : active raid1 sda3[3] sdb3[2]
      1073741632 blocks super 1.0 [2/1] [_U]
      [>....................]  recovery =  4.8% (52262208/1073741632) finish=88.1min speed=193162K/sec

md1 : active raid1 sda2[3] sdb2[2]
      524224 blocks super 1.0 [2/2] [UU]

md0 : active raid1 sda1[3] sdb1[2]
      8388544 blocks super 1.0 [2/2] [UU]

unused devices: <none>