echo 1000000 >/proc/sys/dev/raid/speed_limit_max
echo 200000 >/proc/sys/dev/raid/speed_limit_min

# cat /proc/sys/dev/raid/speed_limit_max
200000

# cat /proc/sys/dev/raid/speed_limit_min
1000

cat /proc/mdstat  | grep -B2 reco
cat /proc/mdstat |grep recovery
 
mdadm -D /dev/md1