Thanks for the tutorial. It works for me but only with this additional steps.
I checked my disks with
hdparm -B /dev/sd?
My HDD was > 127 (do not allow to spin down)
So I edit
/etc/hdparm.conf
and I added on the end of file
/dev/disk/by-id/ata-Hitachi_My_disk_id {
spindown_time = 180...