Powernap doesn't detect disk activities
I am pretty new to Ubuntu world! I am a mechanical engineer and trying to setup a NAS to share video and music file in my home. I setup the Ubuntu 11.10 on one of my old computers and get Samba server setup. I have 2 disks in my computer. Sda is the system where hosts Ubuntu and sdb is the one has all the video and audio files.
Now I am thinking to save energy. Since I don't want the server to run all the time. My strategy is when I need the server , I will use WOL to wake it up. But if the server detects there is activities of the disks for more than 10 minutes. It will power off.
So far the WOL part is working. But the power off part only partially works. The system turn if off no matter what I am doing. Even when I am accessing a large video file for the server, it is still power off. So it seems the Disk monitor function is not working at all.
I am wondering is anyone here has the similar problem and would like to share the experience.