查看情况

cat /proc/mdstat

ersonalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10] 
md0 : active raid10 sdb1[0] sdf1[4](S) sde1[3] sdd1[2] sdc1[1]
      3906762752 blocks super 1.2 512K chunks 2 near-copies [4/4] [UUUU]
      resync=PENDING
      bitmap: 10/30 pages [40KB], 65536KB chunk

unused devices: <none>

解决方案时强制repair或resync

echo "repair" > /sys/block/md0/md/sync_action