Hi,
It is possible to use hdd spindown. First you uninstall the current LSI9211 driver in windows. Reboot the machine and enable 'disable driver signature' (pressing f8 during boot).
Then change the LSI-sas2.inf driver. Open the inf file in notepad and under [Shutdown_addreg] add;
HKR, "StorPort", "EnableIdlePowerManagement", 0x00010001, 0x01
Install the driver in windows, reboot the machine and then spindown should work.
note; i have my lsi 9211/ibm1015 in IT mode.