I am using sleep with my SAS 9207-8i and its working.
The only thing i had to do was this:
Under Settings, Sleep Settings, Custom commands after wake-up, implement this:
sleep 120;
hdparm -y $(ls /dev/sd*|grep "[a-z]$") >/dev/null 2>&1
2nd Point: If you push the Sleep-Button or the time for sleep is reached, the server takes aprox. 60-120sec to really go to sleep - so be patient.