Raid remove from array

root@host:/dev# mdadm --create --verbose /dev/md1 --level=mirror --raid-devices=4 ram0 ram1 ram2 ram3
mdadm: Note: this array has metadata at the start and
    may not be suitable as a boot device.  If you plan to
    store '/boot' on this device please ensure that
    your boot-loader understands md/v1.x metadata, or use
    --metadata=0.90
mdadm: size set to 65472K
Continue creating array? y
mdadm: Defaulting to version 1.2 metadata
mdadm: array /dev/md1 started.
root@host:/dev# cat /proc/mdstat
Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10]
md1 : active raid1 ram3[3] ram2[2] ram1[1] ram0[0]
      65472 blocks super 1.2 [4/4] [UUUU]

md0 : active raid1 sdb6[2] sda6[0]
      76105600 blocks super 1.2 [2/2] [UU]

unused devices: <none>
root@host:/dev# mdadm --fail /dev/md1 ram2
mdadm: set ram2 faulty in /dev/md1
root@host:/dev# mdadm --remove /dev/md1 ram2
mdadm: hot removed ram2 from /dev/md1
root@host:/dev# cat /proc/mdstat
Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10]
md1 : active raid1 ram3[3] ram1[1] ram0[0]
      65472 blocks super 1.2 [4/3] [UU_U]

md0 : active raid1 sdb6[2] sda6[0]
      76105600 blocks super 1.2 [2/2] [UU]

unused devices: <none>
root@host:/dev# mdadm --grow /dev/md1 --raid-devices=3
raid_disks for /dev/md1 set to 3
root@host:/dev# cat /proc/mdstat
Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10]
md1 : active raid1 ram3[3] ram1[1] ram0[0]
      65472 blocks super 1.2 [3/3] [UUU]

md0 : active raid1 sdb6[2] sda6[0]
      76105600 blocks super 1.2 [2/2] [UU]

unused devices: <none>