Enable monitoring of MD (software RAID) devices

After you have created the RAID (via YAST): 
 #insserv -d mdadmd 
 to have mdadm run as a daemon in the background in the deafult
runlevels (usually 3 and 5) monitoring your devices. Or you can run it
manually using 
 #mdadm --monitor --scan --daemonise > /var/run/mdadm 
 this also writes the pid to /var/run/mdadm file. 
 Also, check it by running: 
 #chkconfig -l mdadmd 
 mdadmd

0:off

1:off

2:off

3:on

4:off

5:on

6:off