cat /proc/mdstat
Personalities : [raid1] [linear] [multipath] [raid0] [raid6] [raid5] [raid4] [raid10]
md0 : active raid1 sdb1[2] sdd1[0]
1953380352 blocks super 1.2 [2/1] [U_]
[===>.................] recovery = 18.8% (369149952/1953380352) finish=18202.8min speed=1450K/sec
bitmap: 11/15 pages [44KB], 65536KB chunk