May I ask, what temperature according to the Promise utility you see for controller and backplane for a given room temperature for both your 2TB and 4TB model?
The Room has 26C and right now all of the 2TB disks have 38C (power cycle max is 39C; and lifetime max is 45C); controller is 51C, backplane is 48C; 1400rpm. The 4TB disk #1 has 43C (power cycle max is 45C and lifetime max is 49C); controller is 58C, backplane is 49C; 2200rpm.
I think the backplane max of 50 means it will spin the fan as fast as needed to keep backplane temp below 50C; so you should actually never reach backplane temp above 50C.
hope this helps
Last edited: