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The storage-management software causes the fan and communications module
fault LED and storage subsystem fan LED to light before the temperature has risen
sufficiently to shut down the power supplies. The storage subsystem fan LED,
shown in Figure 95, is lit when the DS4500 Storage Subsystem temperature
exceeds 45° C (113° F). The DS4500 Storage Subsystem shuts down if the
temperature rises to 70° C (158° F). If both power supplies shut down, the fault
LED cannot light.
Storage
subsystem
fan LED
GS000048a
Turning on the power after an overtemperature shutdown
If your DS4500 Storage Subsystem shuts down unexpectedly and you received a
″Maximum temperature exceeded ″ alert from the storage subsystem before it
shutdown, take the following precautions to cool it before you power on the unit:
1. Turn off the power switches to allow the DS4500 Storage Subsystem to cool.
2. When the room temperature is below the upper operating temperature of 35° C
(95° F), turn on the power switches.
Figure 94. Fan and communications and power supply fault LEDs
Figure
95. Storage subsystem fan LED
140 IBM TotalStorage DS4500 Fibre Channel Storage Subsystem: Installation, User’s, and Maintenance Guide