The problem right now is that smartmon, pure and simple, isn't working -- it's not getting the data. It won't be able to give you any advance warning should your SATA drives decide to slowly go south on you.

From the sounds of the error, -d won't work for you because your version specifically states it doesn't support -d yet, and neither do your device drivers. A kernel upgrade, then an upgrade to smartmon, is needed to get smartmon back in order as I see it.