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Storage subsystem fan
The storage subsystem fan is a single, removable unit that contains two cooling
fans and temperature monitoring circuitry. The storage subsystem fan plugs directly
into a slot on the front of the DS4500 Storage Subsystem, to the left of the
controllers (see Figure 1 on page 7). There are five LEDs that provide overall
system status information (see Figure 88 on page 127). The dual fans in the
storage subsystem fan unit provide a redundant cooling system to both controller
CRUs. If one fan fails, the other continues to operate, providing sufficient air
circulation to prevent the controllers from overheating until you can replace the
entire storage subsystem fan.
To prevent cooling problems, the DS4500 Storage Subsystem must have proper air
circulation throughout the chassis. Cooling problems include any malfunctions or
obstructions that impede air flow and cause one or more components in the
DS4500 Storage Subsystem to overheat. Make sure that the ambient air
temperature around the DS4500 Storage Subsystem is within the environmental
requirements. To boost air circulation, the DS4500 Storage Subsystem chassis has
air vents along its top and sides. These vents serve as air intake and exhaust
passages. Always keep vents clean and free of obstructions.
Figure 4 on page 9 shows the DS4500 Storage Subsystem air flow. Make sure your
installation site allows adequate ventilation to the DS4500 Storage Subsystem
during operation.
Note: Allow at least 60 cm (2 ft) of clearance in front of and behind the DS4500
Storage Subsystem for proper ventilation.
Figure 3. DS4500 Storage Subsystem bezel
8 IBM TotalStorage DS4500 Fibre Channel Storage Subsystem: Installation, User’s, and Maintenance Guide