Chapter 3: System Interface supplies are hot-plug units, you do not need to remove power from the system when replacing. (The third power supply unit is a backup that activates automatically to keep power supplied to the system.) l Fan Fail: Indicates a system fan failure. This may be one or more of the four hot-swap intake fans or the two exhaust fans. A fan failure is accompanied by an audible alarm, which you can disable with the alarm switch on the control panel. When a fan stops working, all the other sys- tem fans will increase their RPM to compensate until the failed unit is re- placed.
(See Section 6-2 for more details.) Refer to Section 6-3 for in- structions on replacing system fans. It is unnecessary to power down the system as these are hot-swap fans. Note: You must use the exact same brand and rating of fan for replacement. These can be obtained directly from Supermicro. l Overheat: Indicates an overheat condition in the chassis. This may be caused by cables obstructing the airflow in the system, or the ambient room temperature being too warm. You should also check to make sure that the chassis cover is installed and that all fans are present and operat- ing normally. l SCA Channel: Indicates an overheat condition in the area of the SCA SCSI drives and backplane.
This may be caused by cables obstructing the airflow in the system, or the ambient room temperature being too warm. You should also check to make sure that the chassis cover is installed and that all fans are present and operating normally. 3-3