System Airflow - Seagate Exos AP 4U100 Installation And Maintenance Manual

Module LED
System Fan Status LED:
Figure 17 LEDs: System fan module
Multiple system fan modules
The 4U100 enclosure includes four rear system fans 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 CRU 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.
System fans are hot-swappable and replacement should only take a few seconds. Replacement must be completed as
soon as possible after the removal of the defective system fan to avoid a thermal exception. The replacement procedure
should be completed within an absolute maximum of 2 minutes.
IMPORTANT: Operation of the enclosure with any modules missing will disrupt the airflow, and the drives will 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.
System Fan OK (OFF) Fan fault/ID (amber/blinking amber)
System fan status LED
System fan oriented for use in rear panel slot
LED behavior states
Overview of rear panel LEDs
Power OFF (OFF)
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