cat /proc/mdstat
mdadm –detail /dev/md127

yum install smartmontools -y

ls -l /dev | grep -E ‘sd|hd’
smartctl –scan

smartctl –info /dev/sda
smartctl -s on -a /dev/sda

smartctl -A /dev/sda
smartctl -A /dev/sdb
smartctl -H /dev/sdc

test

for i in {a,b,c,d,e,f,g}; do smartctl -A /dev/sd$i|grep Power_On_Hours; done

check
cat /proc/scsi/scsi

smartctl -a -d megaraid,4 /dev/sdb

Raid
dd if=/dev/zero of=testfile1 bs=1G count=1 oflag=dsync

Disk
dd if=/dev/zero of=testfile2 bs=512 count=1000 oflag=dsync