cat /sys/block/sda/queue/scheduler

echo deadline >   /sys/block/sda/queue/scheduler

smartctl -a /dev/sda
smartctl -a -d megaraid,6 /dev/sda
smartctl -a -d sat /dev/sg1


$ cat sys/block/md0/md/
mismatch_cnt
0

$ arcconf datascrub 1 period 30