Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10] 
md0 : active raid5 sda[0] sdc[3] sdb[1]
      976772992 blocks level 5, 64k chunk, algorithm 2 [3/2] [UU_]
      [==========>..........]  recovery = 52.4% (256192384/488386496) finish=151.8min speed=25480K/sec
      
unused devices: <none>