Have the same issue? Flashed it to the newest Version; and fans will run at intermediate speed for about 10 hours, get message of temperature differential and fans set to high speed. RWC2 shows temps between 17 and 20 degrees C. Have 8 drives installed and the blanks are in the other cages. Seems the only way to get it quiet is complete shutdown, and then it will run at an acceptable noise level for 10 to 12 hours.
Installed a second power supply, and still had the same issue. It is only speculation on my part, but the town I live in had high line voltage going into houses (128 Volts) according to the report from the two different UPSs' in the server closet. There would be an event logged that the UPS was compensating for high line voltage. The whole town was shut down one day for electrical work, and when we came back up the line voltage was down to 120 - 121. That has been 10 days and since then the JBOD has only gone crazy once, and the UPS logs indicated the were compensating for line noise. This happened at almost the same time that the fans went nuts. You may want to look for events in the UPS logs that match up with the RWC2 event logs.
Message was edited by: Phillip Funk