livecd gentoo # cat /proc/mdstat
Personalities : [raid0] [raid1] [raid6] [raid5] [raid4] [raid10]
md1 : active raid1 sdb2[1] sda2[0]
      383519680 blocks [2/2] [UU]
      [===================>.]  resync = 96.9% (371681792/383519680) finish=2.9min speed=66529K/sec

md0 : active raid1 sdb1[1] sda1[0]
      104864192 blocks [2/2] [UU]
        resync=DELAYED

unused devices: <none>