I've been using the auto fan plugin for a while now and just set my drives to spin down, with all the main array drives spun down, except the cache drive, auto fan turns off the fans:
"autofan: Highest disk temp is 0C, adjusting fan speed from: FULL (100% @ 1976rpm) to: OFF (0% @ 738rpm)"
But the cache drive starts to get really hot, over 40degC, it is included in the auto fan plugin drives list but it seems like the cache temperature is ignored when the main mechanical drives are spun down. Any ideas?
Update: With (1) drive spun up auto fan detects it's temperature but still ignores the cache drive:
autofan: Highest disk temp is 32C, adjusting fan speed from: FULL (100% @ 1567rpm) to: OFF (0% @ 597rpm)