System Fan Module; System Airflow - Seagate Exos E 4U106 Hardware Installation And Maintenance Manual

System fan module

Enclosure cooling is provided by four system fan modules used in combination with two controller channel fan
modules. The IOM provides fan and LED control. This section describes system fan modules. See also
channel fan module" (page
Module LED
System Fan Status LED:
Figure 13 LEDs: System fan module – rear panel
Multiple system fan modules
The 4U106 enclosure includes four system fan FRUs which provide redundant cooling for the system, so that if one
module fails, the others maintain airflow circulation, and enclosure operation is not affected while you replace the
faulty module. Within this FRU module, if one of the two internal rotors fails, then a fault occurs, indicating
module failure. A dual rotor failure is reported as a dual-fault. Refer to FRU Replacement Time Limit
for maximum allowable time to replace FRUs. See section
"Replacing a controller fan module" (page 79)
IMPORTANT: Operation of the enclosure with any modules missing disrupts the airflow, and the drives do not
receive sufficient cooling. It is essential that all slots are fitted with system fans prior to powering on the enclosure.

System airflow

The system must be operated with low pressure rear exhaust installation. Back pressure created by rack doors and
obstacles is not to exceed 5 pascals (0.5mm water gauge). The cooling system provides sufficient capacity to
ensure that maximum temperatures are not exceeded.
IMPORTANT: The environment in which the enclosure operates must be dust-free to ensure adequate airflow.
28 System overview
33).
System Fan OK Fan fault/ID (amber/blinking amber)
(Off)
for replacement instructions.
System fan status LED
System fan oriented for use in rear panel slot
LED behavior states
"Replacing a system fan module" (page 77)
"Controller
Power off (Off)
(Table 12)
and